Request capability to learn the room name

We now need the room name in order to implement the mobile (widget-based) designs with the app bar.

src/widget.ts

@@ -124,6 +124,7 @@ export const widget = ((): WidgetHelpers | null => {
       }));
       const receiveState = [
         { eventType: EventType.RoomCreate },
+        { eventType: EventType.RoomName },
         { eventType: EventType.RoomMember },
         { eventType: EventType.RoomEncryption },
         { eventType: EventType.GroupCallMemberPrefix },