🔥 Remove extra dispose

Author: AlexV525

lib/src/delegates/asset_picker_builder_delegate.dart

@@ -166,7 +166,6 @@ abstract class AssetPickerBuilderDelegate<A, P> {
   /// Keep a dispose method to sync with [State].
   /// 保留一个 dispose 方法与 [State] 同步。
   void dispose() {
-    provider.dispose();
     gridScrollController.dispose();
     permission.dispose();
     permissionOverlayHidden.dispose();