fix(Autocomplete): fix the styling for the clear button

[lukicenturi]

Before:

After:

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.

Project coverage is 82.85%. Comparing base (914b976) to head (fac1c31).

Files with missing lines	Patch %	Lines
...components/forms/auto-complete/RuiAutoComplete.vue	14.28%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #318      +/-   ##
==========================================
- Coverage   85.44%   82.85%   -2.60%     
==========================================
  Files         115      115              
  Lines       10390    10393       +3     
  Branches     1286     1286              
==========================================
- Hits         8878     8611     -267     
- Misses       1512     1782     +270     

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[kelsos]

lgtm