Fix `tag` icon display in the project ref selector dropdown

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What does this MR do and why?

This commit aims to fix the tag icon display in the project ref selector dropdown when navigating from the project's tag view via Browse files button.

Closes: #457130 (closed)

Changelog: changed

Screenshots or screen recordings

Before	After
before.mov	after.mov

How to set up and validate locally

1. Run GitLab.
2. Navigate to the <project> -> Code -> Tags.
3. Choose any tag (or create if it doesn't exist) and navigate to the tag view by clicking on a tag name.
4. Find the Browse files button (on the top right) and click it.
5. Observe the result in a project ref selector dropdown.