Use effectiveUid instead of callingUid to set lockTaskMode

The callingUid can be different from that of the app been locked
(e.g. was launched from launcher) there by leading to the app crashing
when it tries to exit lockTaskMode.

Bug: 24146132
Change-Id: I03346fabd1d7e61b29178220c72f747a0600f5ec
1 file changed