Add missing checkbox for api_impot_part_sandbox forms #3242

Job	Run time
build	2m 25s
Linting: Rubocop	52s
Security: Brakeman	45s
Unit tests: RSpec	1m 29s
Linting: Standardjs	41s
Linting: YAML through prettier	35s
Integration tests: admin / Cucumber job	1m 39s
Integration tests: others / Cucumber job	1m 27s
Integration tests: other habilitations / Cucumber job	1m 31s
Integration tests: dgfip habilitations / Cucumber job	1m 29s
Merge develop with main	0s
Continuous deployment on staging	0s
	12m 53s

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