message: Fix last queue integration test
diff: @@ -97,6 +97,9 @@ fn do_pop<S: Storage, A: Api>(deps: &mut Extern<S, A>, _env: Env) -> Result<Resp
  let mut res = Response::default();
  if let Some((k, v)) = first {
  + // force k to be 1 byte (this is not guaranteed right now with external storage)
  + // TODO: remove this once 187 is merged
  + let k = &k[0..1];
  // remove from storage and return old value
  deps.storage.remove(&k);
  res.data = Some(Binary(v));
  