fix(datepicker): fixed inline datepicker subscriptions

[SvetlanaMuravlova]

fix(datepicker): fixed inline datepicker subscriptions
close #6263

What to test:
In inline datepicker and daterangepicker was fixed subscriptions

Preconditions:
use local version from this branch for reproducing this fix from issue

How to test:
on local version try reproducing as in issue example

[github-actions]

Visit the preview URL for this PR (updated for commit b5db1c4):

https://ngx-bootstrap-demo--pr6339-fix-datepicker-subsc-0zv35txm.web.app

_{(expires Tue, 18 Jan 2022 12:30:25 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[codecov]

Codecov Report

Merging #6339 (b5db1c4) into development (acd560b) will increase coverage by 0.05%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #6339      +/-   ##
===============================================
+ Coverage        75.86%   75.91%   +0.05%     
===============================================
  Files              344      315      -29     
  Lines            10777    10638     -139     
  Branches          2547     2933     +386     
===============================================
- Hits              8176     8076     -100     
+ Misses            2591     2561      -30     
+ Partials            10        1       -9     

Impacted Files	Coverage Δ
...picker/themes/bs/bs-custom-dates-view.component.ts	60.00% <0.00%> (-20.00%)	⬇️
src/datepicker/utils/bs-calendar-utils.ts	74.68% <0.00%> (-16.75%)	⬇️
src/sortable/sortable.component.ts	5.55% <0.00%> (-13.34%)	⬇️
src/dropdown/bs-dropdown.directive.ts	78.08% <0.00%> (-11.29%)	⬇️
src/tooltip/tooltip.directive.ts	57.04% <0.00%> (-7.30%)	⬇️
src/timepicker/reducer/timepicker.reducer.ts	86.00% <0.00%> (-6.00%)	⬇️
src/pagination/pagination.component.ts	84.37% <0.00%> (-5.23%)	⬇️
src/timepicker/timepicker.component.ts	87.70% <0.00%> (-5.12%)	⬇️
src/modal/modal.directive.ts	4.00% <0.00%> (-4.72%)	⬇️
src/datepicker/bs-datepicker-input.directive.ts	39.39% <0.00%> (-4.36%)	⬇️
... and 183 more

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[cypress]

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Test summary

748 • 84 • 14 • 0

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Run details

Project	ngx-bootstrap
Status	Failed
Commit	8e1f193 ℹ️
Started	Dec 23, 2021 3:00 PM
Ended	Dec 23, 2021 3:37 PM
Duration	37:06 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 93

View run in Cypress Dashboard ➡️

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Failures

	typeahead_page_spec.ts		1
1	Typeahead demo page testing suite > On blur > clicking anywhere outside auto-fills "Option on blur" with the first option from the matches list
	datepicker/locales_spec.ts		2
1	Datepicker demo testing suite: Locales > Change Locale Datepicker > when user chose locale es-pr for "Datepicker", container shown in appropriate language
2	Datepicker demo testing suite: Locales > Change Locale DateRangepicker > when user chose locale es-pr for "Daterangepicker", container shown in this language
	dropdowns_page_spec.ts		2
1	Dropdowns demo page testing suite > Auto close > when user clicks on the first "Button dropdown", then dropdown opened and there are 3 items inside when user press "ESC", then this dropdown closes
2	Dropdowns demo page testing suite > Auto close > when user clicks on the second "Button dropdown", then dropdown opened and there are 3 items inside when user press "ESC", nothing happens
	modals_service_page_spec.ts		5
1	Modals demo page testing suite: Service examples > Nested modals > when user clicks on the button "Open second modal" then the second modal with title "Second modal" is opened, "Close self" is present
2	Modals demo page testing suite: Service examples > Events > when user closes modal by pressing ESC button then modal is closed and should be messages "onHide event has been fired" and "onHidden event has been fired"
3	Modals demo page testing suite: Service examples > Confirm Window > when user clicks on "Open modal" button then modal is opened, it contains two buttons: "Yes" and "No"
4	Modals demo page testing suite: Service examples > Esc closing option > when user clicks on "Open modal" button then modal is opened. when user closes modal by click ESC button then modal stays opened
5	Modals demo page testing suite: Service examples > Esc closing option > after that click on "Open modal" button, modal popup is opened. when user press ESC button then modal is closed
This comment includes only the first 10 test failures. See all 84 failures in the Cypress Dashboard.

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[valorkin]

unsubscribe should be in all versions I suppose

[valorkin]

Suggested change

this._subs = [];