webrtcendpoint: Remove audio elements in a test without audio
webrtcendpoint: Remove audio elements in a test without audio

Change-Id: Id12140ce968fc5abe171c89f80efce9041c21ee2

TribeMedia/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements