Fix memory leak of "torrcd" in test_config_include_folder_order()

Bugfix on 0265ced02b7a652c5941cb2c14ee1e0de0b1d90e; bug not in any
released Tor.

src/test/test_config.c

@@ -5163,6 +5163,7 @@ test_config_include_folder_order(void *data)
 
  done:
   config_free_lines(result);
+  tor_free(torrcd);
   tor_free(path);
   tor_free(path2);
   tor_free(dir);