title: "editable" prop doesn't work for LexicalComposer
body: <p>I'm making a rich text editor with Lexical react. I'm reasonably experienced in React. My problem is I can't get the editor to flip between editable and readonly modes. It's stuck in whatever mode it's set when I first load the app. Here is the code snippet - as you can see, I print out the &quot;editable&quot; value and confirm it changes between <code>true</code> and <code>false</code> correctly (but the editor mode doesn't change with it):</p>
  <pre><code>  editorConfig = {
      ...
      editable: editable,
    }
    console.log(`editable is ${editable}`);
    return (
      &lt;LexicalComposer initialConfig={editorConfig}&gt;
  </code></pre>
  <p>Any help is appreciated!</p>