fix analyzer issues

Author: denrase

flutter/lib/src/screenshot/sentry_screenshot_widget.dart

@@ -9,7 +9,6 @@ import 'package:meta/meta.dart';
 import 'package:flutter/widgets.dart' as widgets;
 
 import '../../sentry_flutter.dart';
-import '../sentry_flutter_options.dart';
 
 /// Key which is used to identify the [RepaintBoundary]
 @internal

flutter/lib/src/sentry_flutter.dart

@@ -9,7 +9,6 @@ import 'event_processor/android_platform_exception_event_processor.dart';
 import 'event_processor/flutter_enricher_event_processor.dart';
 import 'event_processor/flutter_exception_event_processor.dart';
 import 'event_processor/platform_exception_event_processor.dart';
-import 'event_processor/screenshot_event_processor.dart';
 import 'event_processor/url_filter/url_filter_event_processor.dart';
 import 'event_processor/widget_event_processor.dart';
 import 'file_system_transport.dart';