fix mssing type annotation for BulkEditDialog.buttons_layout

Author: nvandamme

ui/opensnitch/plugins/list_subscriptions/ui/bulk_edit_dialog.py

@@ -60,6 +60,7 @@
 class BulkEditDialog(QtWidgets.QDialog, BulkEditDialogUI):
     if TYPE_CHECKING:
         rootLayout: QtWidgets.QVBoxLayout
+        buttons_layout: QtWidgets.QHBoxLayout
         changes_section_bar: QtWidgets.QFrame
         changes_section_label: QtWidgets.QLabel
         selection_hint_label: QtWidgets.QLabel