Ensure that OpenByDefaultDialog is created for config change

THe open by default dialog wasn't being re-created when the device
language changed, so now we listen to config changes and teardown the
dialog if the locale, light/dark mode or font scale has changed, so it
can be re-created with the updated UI elements when next opened

Bug: 442025733
Test: manual testing
Flag: EXEMPT bugfix
Change-Id: I25502f5740bdac98b4ee98f0dacc4427162413b7