Modifying mock firebase_options.dart for CI compilation fix

Author: MrCsabaToth

.github/workflows/main.yaml

@@ -27,7 +27,7 @@ jobs:
         echo "// ignore_for_file: type=lint" >> lib/firebase_options.dart
         echo "import 'package:firebase_core/firebase_core.dart' show FirebaseOptions;" >> lib/firebase_options.dart
         echo "import 'package:flutter/foundation.dart'" >> lib/firebase_options.dart
-        echo "  show defaultTargetPlatform, TargetPlatform;" >> lib/firebase_options.dart
+        echo "    show defaultTargetPlatform, TargetPlatform;" >> lib/firebase_options.dart
         echo "" >> lib/firebase_options.dart
         echo "class DefaultFirebaseOptions {" >> lib/firebase_options.dart
         echo "  static FirebaseOptions get currentPlatform {" >> lib/firebase_options.dart