handle deleting instances

Author: AhmedAbdoElhawary

lib/features/sorting/bubble/view/bubble_sort_page.dart

@@ -17,12 +17,6 @@ class BubbleSortPage extends ConsumerStatefulWidget {
 }
 
 class _BubbleSortPageState extends ConsumerState<BubbleSortPage> {
-  @override
-  void deactivate() {
-    ref.invalidate(_notifierProvider); // deletes current instance and resets
-    super.deactivate();
-  }
-
   @override
   Widget build(BuildContext context) {
     return SortingPage(instance: _notifierProvider, title: StringsManager.bubbleSort);