Fix issues around how remote/local video states affect call view.

// FREEBIE

Signal/src/view controllers/CallViewController.swift

@@ -458,6 +458,7 @@ class CallViewController: UIViewController, CallObserver, CallServiceObserver, R
         }
 
         self.localVideoConstraints = constraints
+        updateCallUI(callState: call.state)
     }
 
     // MARK: - Methods
@@ -546,12 +547,17 @@ class CallViewController: UIViewController, CallObserver, CallServiceObserver, R
         ongoingCallView.isUserInteractionEnabled = !isRinging
 
         // Rework control state if remote video is available.
-        contactAvatarView.isHidden = !remoteVideoView.isHidden
+        let hasRemoteVideo = !remoteVideoView.isHidden
-        speakerPhoneButton.isHidden = !remoteVideoView.isHidden
+        contactAvatarView.isHidden = hasRemoteVideo
-        audioModeMuteButton.isHidden = !remoteVideoView.isHidden
+
-        videoModeMuteButton.isHidden = remoteVideoView.isHidden
+        // Rework control state if local video is available.
-        audioModeVideoButton.isHidden = !remoteVideoView.isHidden
+        let hasLocalVideo = !localVideoView.isHidden
-        videoModeVideoButton.isHidden = remoteVideoView.isHidden
+        for subview in [speakerPhoneButton, audioModeMuteButton, audioModeVideoButton] {
+            subview?.isHidden = hasLocalVideo
+        }
+        for subview in [videoModeMuteButton, videoModeVideoButton] {
+            subview?.isHidden = !hasLocalVideo
+        }
 
         // Also hide other controls if user has tapped to hide them.
         if areRemoteVideoControlsHidden && !remoteVideoView.isHidden {