Roll out bugfix enable_hardware_shortcut_disables_warning

This has been in trunkfood for 4 months.

(This flagged fix was originally tagged as a feature flag, but
under current org guidelines this should have been treated as
a minor bugfix flag.)

Bug: 287065325
Change-Id: Idfa29ae0d1e3c2b3b98a9357dd06b6746e499988
Flag: com.android.server.accessibility.enable_hardware_shortcut_disables_warning