Fix wrong orientation change when a video call ends

When video call is disconnected,
VideoCallPresenter#checkForOrientationAllowedChange is invoked with
"Call(= null)". When Call is null, set "DISALLOW" to
Activity#setAllowOrientationChange. It causes that the end call screen
is displayed in portrait mode even if in landscape mode.

This is an upstream change:
https://android-review.googlesource.com/c/platform/packages/apps/Dialer/+/694787

Bug: 80375554
Test: manual
PiperOrigin-RevId: 201046687
Change-Id: Id08db0e399e067bd85ae44444de3e78aae14f67d