Fix KeyguardTransitionInteractorTest

Two tests were failing because of inconsistent `runCurrent` behavior,
but this test is currently disabled in presubmit for other flaky tests.

Bug: 349785004
Flag: com.android.systemui.scene_container
Test: test_only
Change-Id: Ia6c4e104e1be41123393ce18b0c60e71993dddc1