bin/inbox: Fix bug in selection on app exit — radicle-tui

There was a regression on the notification selection when exiting the app, where the selected notification from the unfiltered instead of the filtered list was returned.

             RepositoryMode::ByRepo((_, name)) => name.clone().unwrap_or_default(),
         };
         let notifications = state.browser.items.lock().unwrap().to_vec();
         let notifications = state.browser.items();
         // Compute statistics
         let mut seen = 0;