Fix keyboard vibration settings delay

The default settings observer delay is 10s for
background service. It cause the apps get the
settings update delay and lead a unsync behavior.

Update the settings change without delay.

Bug: 327094397
Test: Manual test with bug steps
Test: atest KeyboardVibrationTogglePreferenceControllerTest
Change-Id: Ib1c23ec9e1442e8397c7a36ffa157594ac64a9b3
(cherry picked from commit f2174611)
Merged-In: Ib1c23ec9e1442e8397c7a36ffa157594ac64a9b3