fix(topbar): also subscribe to current_model

Author: cameronr

lua/opencode/ui/topbar.lua

@@ -109,12 +109,14 @@ end
 
 function M.setup()
   state.subscribe('current_mode', on_change)
+  state.subscribe('current_model', on_change)
   state.subscribe('active_session', on_change)
   M.render()
 end
 
 function M.close()
   state.unsubscribe('current_mode', on_change)
+  state.unsubscribe('current_model', on_change)
   state.unsubscribe('active_session', on_change)
 end
 return M