Removing remaining pieces of action key tutorial from touchpad tutorial

This also fixes issue with keyboard shortcuts being disabled in touchpad tutorial

Fixes: 365752281
Fixes: 358105049
Flag: com.android.systemui.shared.new_touchpad_gestures_tutorial
Test: code compiles and TouchpadTutorialActivity can be launched
Test: keyboard shortcuts can be used while TouchpadTutorialActivity is active
Change-Id: I955be164ad469bae47a5e6b0aadcd755b6a78818