update KvStoreBackupCallbackJsTest.js.

Signed-off-by: Nlixinyi1094590959 <lixinyi38@huawei.com>

distributeddatamgr/distributedKVStoretest/distributedKVStorejstest/hap/src/main/js/test/KvStoreBackupCallbackJsTest.js

@@ -66,6 +66,7 @@ function publicCloseKvStore() {
                     reject(err);
                 }
                 console.info('Test deleteKVStore data = ' + data);
+                resolve(data);
             });
         });
     })