Only animate to hotseat when launcher is on home screen

Was assuming that resume == home-screen; however, in shell
transitions, launcher is resumed while overview is active,
so make sure it is both resumed AND "isTaskbarAligned"
before making the to-hotseat animation

Bug: 241800590
Test: Open an app, long-press taskbar to stash, long-press again
      to unstash
Change-Id: I117afcb006c363e50205f27f014ffc30d6f2896a