message: fix: ensure correct url for meta updates
diff: @@ -5,8 +5,13 @@ import fetch from "../utils/fetch";
  export default createPromiseThunkAction(
  "LOAD_SCHEMA",
  async (_, __, getState) => {
  - const uri = [getState().base, "api/state.json"].join("/");
  - const response = await fetch(uri);
  + const response = await fetch(`${prefix(base)}/api/state.json`);
  return response.json();
  }
  );
  +
  +function prefix(base) {
  + return base.charAt(base.length - 1) === "/"
  + ? base.slice(0, base.length - 1)
  + : base;
  +}
  