Fix videoStateToString for audio/paused state.

The videoStateToString method erroneously assumed that if the videostate
was Audio - Paused, that it was audio-only.  Simple logic error to fix.

Test: Added new unit tests.
Bug: 35645334
Change-Id: Ia5ae4d05284b70ad4ba86b8e5d2c53ee8e68a1fa