Do not let QS handle touches where clipped.

Fixes: 196002042
Fixes: 199657455
Bug: 193350347
Test: tap the status bar; unable to trigger any QS tile
Test: drag the QS open by a few mm; unable to trigger any QS tile
Test: open shade, scroll notifications to partially obscure a QS tile; tile is pressable down to the clip, but when clicking below the clip, the default "collapse shade" behavior kicks in.
Test: expand QS with 2 fingers; opens fully expanded QS
Test: fingerprint unlock; expand shade with 1 finger; occasionally opens fully expanded shade: b/193350347
Change-Id: Ie264ee69570f72f5653b423a8649663e3aab1df9