Fix embedded mode

This was trying to get the room alias, which causes the config to be
read. We don't need the room alias here though, so pass the flag to
not return it.

src/widget.ts

@@ -109,7 +109,7 @@ export const widget: WidgetHelpers | null = (() => {
         baseUrl,
         e2eEnabled,
         allowIceFallback,
-      } = getUrlParams();
+      } = getUrlParams(true);
       if (!roomId) throw new Error("Room ID must be supplied");
       if (!userId) throw new Error("User ID must be supplied");
       if (!deviceId) throw new Error("Device ID must be supplied");