[example] Change JS engine to Hermes

Author: motiz88

example/app.json

@@ -36,7 +36,6 @@
       "eas": {
         "projectId": "b3f193a4-8777-43f6-a872-23a7f325dad7"
       }
-    },
-    "jsEngine": "jsc"
+    }
   }
 }