android: fixed promise rejected with non-error warning

lib/modules/database/reference.js

@@ -133,7 +133,7 @@ export default class Reference extends ReferenceBase {
       .catch((error) => {
         const firebaseError = this.db._toFirebaseError(error);
         if (isFunction(failureCallback)) failureCallback(firebaseError);
-        return Promise.reject(failureCallback);
+        return Promise.reject(firebaseError);
       });
   }