Handling the touch better when the screen turns off

Previously we were only cancelling touches when
showing keyguard, but this is not enough, since
a user might be touching it while on the keyguard
(e.g with falsing)

Fixes: 37287962
Fixes: 36416066
Fixes: 37696557
Test: manual, turn of screen while interacting
Change-Id: I572ade2380986ef087468dff721b1d1dfa7a48ab