Flexiglass: Fix StatusBarRemoteInputCallbackTest when flexi is enabled

During setUp(), we need to mock mDeviceUnlockedInteractorLazy and
mSceneInteractorLazy to make sure the under test object is constructed
correctly.

Bug: 416715566
Test: StatusBarRemoteInputCallbackTest
Flag: TEST_ONLY
Change-Id: Ide74386201e47b8e7f25a5e25536a48beb954148