fix(permissions): Invalidate cache on changing the default permissions

In case of change of global permissions the logic there can change the scope of permissions so much that we need to run a full permissions flush. This fixes  #5700, and fixes  #5701

rhodecode/model/permission.py

@@ -517,6 +517,9 b' class PermissionModel(BaseModel):'
             self.sa.rollback()
             raise
 
+        # because we've FORCED and update here, make sure we reset all permissions cache
+        PermissionModel().trigger_permission_flush()
+
     def update_branch_permissions(self, form_result):
         if 'perm_user_id' in form_result:
             perm_user = User.get(safe_int(form_result['perm_user_id']))