Fix Global Actions animations, and use old power menu when panel is disabled.

Fix Global Actions animations, and use old power menu when panel is disabled.
Also tweak feature flags setup to use old flag as a force option for debugging.

Test: Automated tests pass. Long-press power menu without plugin installed from different device orientations -- menu should animate in from the closest screen edge in all orientations and rotate correctly when device is rotated. Repeat after enabling the settings_global_actions_force_grid_enabled option in Feature Flags to ensure the correct behavior persists when using the new grid layout.

Fixes: 126444760
Fixes: 129698948

Change-Id: I9ac387244a5904f832c5d8b6c40362c00c6a22a2