Remove the preference to PersistentDataStore setting in case when global

setting is being set.

This causes issue with the current design wherein we always store a mode in PersistentDataStore at the first boot. After this, the global setting will never be applied as it had less preference than mode stored in PersistentDataStore.

Bug: 261552562
Test: 'adb shell sumpsys display' shows correct mode.
Change-Id: If0fb02f87ca639508a714a28a549fd65a26484bc