fix(force invert): listen for changes to force invert setting

Ensure that the app reacts when the user changes the force invert
preference in Settings.

Bug: 312289375
Test: manual:
1. Open Settings or some other app in light mode.
1. adb shell device_config set_sync_disabled_for_tests persistent && adb shell device_config put accessibility android.view.accessibility.force_invert_color true && adb shell settings put secure accessibility_force_invert_color_enabled 1
2. Color of the current app should change to be dark

Flag: android.view.accessibility.Flags.forceInvertColor

Change-Id: I39a78d640fe939a110d703343865fe8a88fad020