Extensions manager still thinks widget is in the room after removing it in Element

**Describe the bug**
If you remove a widget using the buttons in Element (as opposed to hitting "Delete" in the extensions manager), opening up the extensions manager continues to show the widget under the "Added to this room banner.

**To Reproduce**
Steps to reproduce the behavior:
1. Use the extensions manager to add a widget to the room.
2. Open the widget so that it's visible in Element's UI
3. Go to the top right corner of the widget, click the ... menu, and click "Remove for everyone" and confirm.
4. Open the extensions manager again and see that it still thinks the widget is in the room.

**Expected behavior**
The extensions manager realises that the widget no longer exists in the room.

**Screenshots**

**Client (please complete the following information):**
- Matrix Client and Version: Element version: 1.11.25
- Desktop app