click on group call thumbnail should return you to the group call, not the 1:1

src/VectorConferenceHandler.js

@@ -44,6 +44,7 @@ ConferenceCall.prototype.setup = function() {
         // looking for a 1:1 room with this conf user ID!)
         var call = Matrix.createNewMatrixCall(self.client, room.roomId);
         call.confUserId = self.confUserId;
+        call.groupRoomId = self.groupRoomId;
         return call;
     });
 };

src/components/structures/LeftPanel.js

@@ -79,7 +79,7 @@ var LeftPanel = React.createClass({
         if (call) {
             dis.dispatch({
                 action: 'view_room',
-                room_id: call.roomId,
+                room_id: call.groupRoomId || call.roomId,
             });
         }
     },