Issues Found When We ran Flutter unit tests

- Some tests failed when flutter unit tests for the rutorrent-flutter application.
- These issues were found due to the modal_bottom_sheet dependency used.
- We can run `flutter test` in the local directory of the project to reproduce the issue.
### Issues found
```
00:01 +0: ...Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart ../../.pub-cache/hosted/pub.dev/modal_bottom_sheet-2.1.0/lib/src/material_with_modal_page_route.dart:4:1
: Error: 'ModalBottomSheetRoute' is imported from both 'package:flutter/src/material/bottom_sheet.dart'
and 'package:modal_bottom_sheet/src/bottom_sheet_route.dart'.
import '../modal_bottom_sheet.dart';
^^^^^^^^^^^^^^^^^^^^^
00:04 +0: ...Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart ../../.pub-cache/hosted/pub.dev/modal_bottom_sheet-2.1.0/lib/src/bottom_sheets/material_bottom_sheet.dar
t:28:13: Error: 'ModalBottomSheetRoute' is imported from both
'package:flutter/src/material/bottom_sheet.dart' and
'package:modal_bottom_sheet/src/bottom_sheet_route.dart'.
.push(ModalBottomSheetRoute(
^^^^^^^^^^^^^^^^^^^^^
../../.pub-cache/hosted/pub.dev/modal_bottom_sheet-2.1.0/lib/src/bottom_sheets/material_bottom_sheet.dar
t:50:10: Error: A value of type 'Object?' can't be returned from an async function with return type
'Future'.
- 'Object' is from 'dart:core'.
- 'Future' is from 'dart:async'.
return result;
^
../../.pub-cache/hosted/pub.dev/modal_bottom_sheet-2.1.0/lib/src/bottom_sheets/bar_bottom_sheet.dart:99:
13: Error: 'ModalBottomSheetRoute' is imported from both
'package:flutter/src/material/bottom_sheet.dart' and
'package:modal_bottom_sheet/src/bottom_sheet_route.dart'.
.push(ModalBottomSheetRoute(
^^^^^^^^^^^^^^^^^^^^^
../../.pub-cache/hosted/pub.dev/modal_bottom_sheet-2.1.0/lib/src/bottom_sheets/bar_bottom_sheet.dart:121
:10: Error: A value of type 'Object?' can't be returned from an async function with return type
'Future'.
- 'Object' is from 'dart:core'.
- 'Future' is from 'dart:async'.
return result;
^
00:06 +0 -1: loading /Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart [E]
Failed to load "/Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart": Compilation failed for testPath=/Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart

To run this test again: /Users/manoj/flutter/bin/cache/dart-sdk/bin/dart test /Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart -p vm --plain-name 'loading /Users/manoj/Downloads/rutorrent-flutter-main/test/service_tests/api_service_test.dart'
Exception: the Dart compiler exited unexpectedly.
package:flutter_tools/src/base/common.dart 10:3 throwToolExit
package:flutter_tools/src/compile.dart 831:9 DefaultResidentCompiler._compile.
dart:async/zone.dart 1406:47 _rootRunUnary
dart:async/zone.dart 1307:19 _CustomZone.runUnary

00:11 +1 -1: Some tests failed.
```