collab_panel: Adjust pressed state of the channel item (#61453)

Yet another follow up to
https://github.com/zed-industries/zed/pull/61423 simplifying the design
even further.

Release Notes:

- N/A
3a44d0f010Danilo Leal committed on 7/22/2026, 11:23:30 AM· committed by GitHubparentbb87c47
1 file changedLine totals unavailable