Remove redundant lint ignore rule

lib/core/configuration.dart

@@ -6,7 +6,6 @@ import 'package:bip39/bip39.dart' as bip39;
 import 'package:ente_auth/core/constants.dart';
 import 'package:ente_auth/core/errors.dart';
 import 'package:ente_auth/core/event_bus.dart';
-// ignore: import_of_legacy_library_into_null_safe
 import 'package:ente_auth/events/signed_in_event.dart';
 import 'package:ente_auth/events/signed_out_event.dart';
 import 'package:ente_auth/models/key_attributes.dart';

lib/onboarding/view/onboarding_page.dart

@@ -1,5 +1,3 @@
-// ignore_for_file: import_of_legacy_library_into_null_safe
-
 import 'dart:async';
 
 import 'package:ente_auth/app/view/app.dart';

lib/onboarding/view/setup_enter_secret_key_page.dart

@@ -1,6 +1,5 @@
 import "package:ente_auth/l10n/l10n.dart";
 import 'package:ente_auth/models/code.dart';
-// ignore: import_of_legacy_library_into_null_safe
 import 'package:ente_auth/utils/dialog_util.dart';
 import 'package:ente_auth/utils/totp_util.dart';
 import "package:flutter/material.dart";

lib/ui/components/expandable_menu_item_widget.dart

@@ -1,7 +1,6 @@
 import 'package:ente_auth/ente_theme_data.dart';
 import 'package:ente_auth/ui/components/captioned_text_widget.dart';
 import 'package:ente_auth/ui/components/menu_item_widget.dart';
-// ignore: import_of_legacy_library_into_null_safe
 import 'package:ente_auth/ui/settings/common_settings.dart';
 import 'package:expandable/expandable.dart';
 import 'package:flutter/material.dart';

lib/ui/home_page.dart

@@ -1,5 +1,3 @@
-// ignore_for_file: import_of_legacy_library_into_null_safe
-
 import 'dart:async';
 import 'dart:io';
 import 'dart:ui';