style: remove unnecessary line break in import statement

- Combine split import statement into a single line for better readability
- This change does not affect functionality, only code formatting

Author: fulleni

lib/settings/view/font_settings_page.dart

@@ -1,5 +1,4 @@
-import 'package:core/core.dart'
-    show AppFontWeight, AppTextScaleFactor;
+import 'package:core/core.dart' show AppFontWeight, AppTextScaleFactor;
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:flutter_news_app_mobile_client_full_source_code/app/bloc/app_bloc.dart';