vg json: --log level

Vector needs to try load a lottie file in a brutal force way,
If the input source is not identified.

src/modules/evas/vg_loaders/json/evas_vg_load_json.c

@@ -51,7 +51,7 @@ evas_vg_load_file_open_json(Eina_File *file,
 
    if (!lot_anim)
      {
-        ERR("Failed lottie_animation_from_file");
+        WRN("Failed lottie_animation_from_file()");
         goto err;
      }