project_panel: Fix double-click on blank area to create a new file (#40503)

Regressed in https://github.com/zed-industries/zed/pull/38008

Release Notes:

- Fixed an issue where double-clicking empty space in the project panel
wouldn’t create a new file.
89be2635d4Smit Barmase committed on 10/18/2025, 12:44:41 PM· committed by GitHubparent3566446
1 file changedLine totals unavailable