test: filter delete only if its parent

Signed-off-by: Raju Udava <86527202+dstala@users.noreply.github.com>

packages/nocodb/src/models/Column.ts

@@ -760,6 +760,7 @@ export default class Column<T = any> implements ColumnType {
         });
       }
       for (const filter of filters) {
+        if (filter.fk_parent_id) continue;
         await Filter.delete(filter.id, ncMeta);
       }
     }