fix(clippy): apply auto-fixable linting suggestions

useragent/lib/features/callouts/callout_event.dart

@@ -1,23 +1,23 @@
-import 'package:arbiter/proto/shared/client.pb.dart';
-import 'package:freezed_annotation/freezed_annotation.dart';
-
-part 'callout_event.freezed.dart';
-
-@freezed
-sealed class CalloutData with _$CalloutData {
-  const factory CalloutData.connectApproval({
-    required String pubkey,
-    required ClientInfo clientInfo,
-  }) = ConnectApprovalData;
-}
-
-@freezed
-sealed class CalloutEvent with _$CalloutEvent {
-  const factory CalloutEvent.added({
-    required String id,
-    required CalloutData data,
-  }) = CalloutEventAdded;
-
-  const factory CalloutEvent.cancelled({required String id}) =
-      CalloutEventCancelled;
-}
+import 'package:arbiter/proto/shared/client.pb.dart';
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'callout_event.freezed.dart';
+
+@freezed
+sealed class CalloutData with _$CalloutData {
+  const factory CalloutData.connectApproval({
+    required String pubkey,
+    required ClientInfo clientInfo,
+  }) = ConnectApprovalData;
+}
+
+@freezed
+sealed class CalloutEvent with _$CalloutEvent {
+  const factory CalloutEvent.added({
+    required String id,
+    required CalloutData data,
+  }) = CalloutEventAdded;
+
+  const factory CalloutEvent.cancelled({required String id}) =
+      CalloutEventCancelled;
+}