Fix naive pinning limit and app tile widgetMessaging NPE

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/stores/WidgetStore.ts

@@ -171,7 +171,7 @@ export default class WidgetStore extends AsyncStoreWithClient<IState> {
         const roomId = this.getRoomId(widgetId);
         const roomInfo = this.getRoom(roomId);
         return roomInfo && Object.keys(roomInfo.pinned).filter(k => {
-            return roomInfo.widgets.some(app => app.id === k);
+            return roomInfo.pinned[k] && roomInfo.widgets.some(app => app.id === k);
         }).length < 2;
     }