Remove start_user_before_scheduled_alarms flag

The flag was reverted from the v/g/r directory in ag/27361359.

Test: printflags | grep start_user_before_scheduled_alarms
Bug: 341252104
Ignore-AOSP-First: Changing flag overrides only.

Change-Id: I6b48ac5f5162bc68a7244d3a599ec0159221f2d9