Flash Notifications color dialog crashs if configuration changes

Root Cause:
When configuration changes, it will recreate fragment then call no args constructor which lead to null pointer exception for error passing parameters in getInstance().

Solution:
* Use setArguments() to pass parameters.
* Move settings key update action into fragment.
* Obsever settings key changes to update summary accordingly.

Bug: 349049233
Test: atest ScreenFlashNotificationColorDialogFragmentTest ScreenFlashNotificationPreferenceControllerTest
Flag: EXEMPT bugfix
Change-Id: Ided0853cf9a989e2f288a85c1aa709f71f7e1cd6