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!

This commit fixes second issue. That means that if you drag the terminal over to the main editor pane (so that it's in a "legit" pane), it'll work. 1st issue still stands though.