remove unnecessary override

app/lib/features/geckoview/domain/entities/states/history.dart

@@ -6,9 +6,6 @@ class HistoryItem with FastEquatable {
 
   HistoryItem({required this.url, required this.title});
 
-  @override
-  bool get cacheHash => true;
-
   @override
   List<Object?> get hashParameters => [url, title];
 }
@@ -34,9 +31,6 @@ class HistoryState with FastEquatable {
     canGoForward: false,
   );
 
-  @override
-  bool get cacheHash => true;
-
   @override
   List<Object?> get hashParameters => [
     items,