[0002] TunerTest fixes for testResourceReclaimedDifferentThread

The TunerHandler is supposed to help test contention over the same
resource, but it won't do so without applyFrontend(). TunerHandler
should use ApplyFrontend() to force resource contention.

Bug: 356779633
Test: test on cuddlefish
Change-Id: I924c04e3ce2cde937189520c03fc650fef1b3b50