[apps] Don't forget to call viewWillAppear

At the moment ViewController::viewWillAppear doesn't do anything, so
there is no real impact. But if we want to use it it needs to be called
from subclasses.

apps/shared/tab_table_controller.cpp

@@ -12,6 +12,7 @@ void TabTableController::didBecomeFirstResponder() {
 }
 
 void TabTableController::viewWillAppear() {
+  ViewController::viewWillAppear();
   selectableTableView()->reloadData();
 }