Revert "Remove unnecessary query in IMMS#switchUserOnHandlerLocked()"

This reverts commit 313a52758136c3661ec3ae2fe02abc50be8f3ffb.

This fixes a lock contention that added a regression in boot time.

Fix: 329414077
Bug: 309837937
Bug: 329163064
Test: n/a
Change-Id: Ie65a60279f36deba82f77520926d81e8a801f1dd
1 file changed