Update TaskbarDelegate to only set default display flags

- Some flags in TaskbarDelegate are not per display so end up getting overriden in methods that are displayId specific.
- The mDisabledFlags isn't set for non primary displays as a result TaskbarDelegate set the flag to 0 when a display is connected. And then TaskbarDelegate updated the SysUIState causing the state to be wrong and also impacting connected displays SysUIState.
- So, updated TaskbarState to only store and apply these flags to SysUIState for primary display.

Fix: 430559029
Test: m
Flag: EXEMPT minor refactor / bug fix
Change-Id: I2505d83222d3818af710537628394e4c2daed156