Fix branch name encoding for dropdown on issue page
What does this MR do?
Fix encoding of branch names in the new branch / new merge request dropdown on issues.
Screenshots
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a Frontend maintainer
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What are the relevant issue numbers?
Edited by Mike Greiling