fix url by prvidin a last &

everything after the last & will be stripped away
-> hence we loose the last param (usually confined to room...)
-> going home kills the all the params which we need to fix!

Signed-off-by: Timo K <toger5@hotmail.de>

src/room/AppSelectionModal.tsx

@@ -63,7 +63,7 @@ export const AppSelectionModal: FC<Props> = ({ roomId }) => {
     });
 
     const result = new URL("element://call");
-    result.searchParams.set("url", url.toString());
+    result.searchParams.set("url", url.toString() + "&");
     return result.toString();
   }, [roomId, roomSharedKey]);