This is a follow-up to https://github.com/zed-industries/zed/pull/51775,
making worktree names in the sidebar appear consistent with the
titlebar.
## Context
- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable
Release Notes:
- N/A
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Co-authored-by: Eric Holk <eric@zed.dev>