Block hub touches when shade is open

The notification shade no longer blocks all touches from filtering down
underneath it, so we have to block touches ourselves when the shade is
open.

Bug: 323265343
Fixed: 323265343
Test: verified manually on device
Flag: ACONFIG com.android.systemui.communal_hub TEAMFOOD
Change-Id: I15eb4e681c58e5ac92b5e9f762e4d4995ac91127