Fix styling of add issuable form input wrapper
What does this MR do and why?
Fixes the issuable form input wrapper on the New merge request page.
Screenshots or screen recordings
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How to set up and validate locally
- Check the issuable reference form field on http://gdk.test:3000/flightjs/Flight/-/merge_requests/new?merge_request%5Bsource_project_id%5D=6&merge_request%5Bsource_branch%5D=3-test-branch&merge_request%5Btarget_project_id%5D=6&merge_request%5Btarget_branch%5D=46-incident-test
MR acceptance checklist
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