[Dark Theme]: fix quick search bar and project selector in User Preferences page

[vikram-raj]

fixes: https://issues.redhat.com/browse/ODC-6634

Screnshots:

Project selector

Before:

After:

Quick Search

Before:

After:

[vikram-raj]

cc: @sg00dwin @mattnolting

[vikram-raj]

/cc @jerolimov

[jerolimov]

Lgtm! 👍

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerolimov, vikram-raj

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[jerolimov]

Propagating docs and px acks from the Epic
/label docs-approved
/label px-approved
/label qe-approved

[openshift-ci]

@vikram-raj: all tests passed!

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