Fix inconsistent background color for filter input field
What does this MR do?
Removes the background color for the filter input field for the projects dashboard and groups page to stay consistent with the other input fields
Are there points in the code the reviewer needs to double check?
None
Why was this MR needed?
Fixes UI inconsistency
Screenshots (if relevant)
Does this MR meet the acceptance criteria?
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CHANGELOG entry added - Tests
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All builds are passing
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Conform by the style guides -
Branch has no merge conflicts with master
(if you do - rebase it please) -
Squashed related commits together
What are the relevant issue numbers?
Closes #21399 (closed)