fixup! terminal/search: Partially fix search in terminal. There are two issues with search in terminal as is: - terminal's pane is not registered as a "legit" pane, so we dispatch buffer search bar::Deploy on the most recent "legit" pane. By legit I mean that workspace::active_pane will *never* return terminal pane as active. - We've had the implementation of as_searchable commented out. Duh!