fix(content): update source with correct event

- Replace SourceUpdated event with LoadSourcesRequested event
- Ensure the source list is refreshed after successful update

Author: fulleni

lib/content_management/view/edit_source_page.dart

@@ -112,7 +112,7 @@ class _EditSourceViewState extends State<_EditSourceView> {
                 SnackBar(content: Text(l10n.sourceUpdatedSuccessfully)),
               );
             context.read<ContentManagementBloc>().add(
-              SourceUpdated(state.updatedSource!),
+              const LoadSourcesRequested(limit: kDefaultRowsPerPage),
             );
             context.pop();
           }