Skip "sync didn't run" WTF when job is stopped too soon

Job scheduler may call onStopJob() right after onStartJob() when a
constraint is no longer satisfied. In that case this WTF shouldn't fire.

Bug: 71866667
Test: manual test (trigger some syncs)
Change-Id: I2ba3b076b60692b02019f3e74b384aea63e27bb4