IMS-VT: Fix race condition

Due to race condition sometimes Preview window
struck for addCall on long run.
Issue happens when onUiShowing(true) is called
after onStateChange() enter video mode.
Fix: Checking for !VideoUtils.isVideoCall(mPrimaryCall).

Change-Id: I5b7b7c78b5705f9924f19b70a6669ee6138cc3c1
CRs-fixed: 2022020
1 file changed