Do not switch to screenshot and finish recents animation for menu options that already do so

The issue is that in landscape mode we add overview shortcuts (e.g. screenshot) to the task view menu, where we switch to screenshot and finish recents animation before executing the shortcut action. However for shortcut actions like screenshot, we do the same, resulting in two chained "switch to screenshot and finish". This is a temporary fix for S given it's late in the cycle and we don't want to introduce unwanted regressions.

Fixes: 192272546
Test: manual
Change-Id: I7ef596e8bce6c15aa4a27163197beac12359b691