Register the subgroup DM integration test in the test suite

tests/test_dm_groups.c

@@ -145,5 +145,5 @@ int main(void) {
     assert(!dm_list_messages_json(nodes[0], conv, 200, 0, json, sizeof(json), &json_len) && strstr(json, "from A1"));
     assert(!dm_conversation_access(nodes[0], other, NULL, NULL)); /* DEVICE остаётся действующей. */
     for (unsigned i = 0; i < 5; i++) utun_instance_destroy(nodes[i]);
-    uasync_destroy(ua); test_remove_dir(root); return 0;
+    uasync_destroy(ua, 0); return 0;
 }