LocalVideo: close previous device when switching device

Change-Id: Ia6a8c56e1b259dd33d85734a85f1a3a652da5206
GitLab: #1446

src/app/commoncomponents/LocalVideo.qml

@@ -31,6 +31,10 @@ VideoView {
             rendererId = id;
         } else {
             const forceRestart = rendererId === id;
+            if (!forceRestart) {
+                // Stop previous device
+                VideoDevices.stopDevice(rendererId);
+            }
             rendererId = VideoDevices.startDevice(id, forceRestart);
         }
     }