Merge pull request #2321 from krille-chan/krille/use-stable-web-auth

build: Switch back to stable web auth package

lib/pages/homeserver_picker/homeserver_picker.dart

@@ -145,7 +145,7 @@ class HomeserverPickerController extends State<HomeserverPicker> {
     final result = await FlutterWebAuth2.authenticate(
       url: url.toString(),
       callbackUrlScheme: urlScheme,
-      options: const FlutterWebAuth2Options(),
+      options: FlutterWebAuth2Options(useWebview: PlatformInfos.isMobile),
     );
     final token = Uri.parse(result).queryParameters['loginToken'];
     if (token?.isEmpty ?? false) return;