Fix tab switcher close item using wrong pane (#42138)

Closes #40646

Release Notes:

- Fixed `tab_switcher::CloseSelectedItem` doing nothing on tab in
inactive pane

Co-authored-by: Cole Miller <cole@zed.dev>
2895d31d83Andrew Farkas committed on 11/6/2025, 8:38:52 PM· committed by GitHubparenta112153
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