terminal: Cannot switch search mode to regex if terminal buffer is in focus

[N8th8n8el]

Check for existing issues

• [X] Completed

Describe the bug / provide steps to reproduce it

See recording: https://github.com/zed-industries/zed/assets/19362696/bb8f5c11-bd9d-48c2-a79a-e602110f511d

Environment

Zed: v0.121.2 (Zed Preview) OS: macOS 14.2.1 Memory: 16 GiB Architecture: aarch64

If applicable, add mockups / screenshots to help explain present your vision of the feature

No response

If applicable, attach your ~/Library/Logs/Zed/Zed.log file to this issue.

If you only need the most recent lines, you can run the zed: open log command palette action to see the last 1000.

No response