bug: hideable for sidebar is not fully supported #243

Having

docs: {
  sidebar: {
    hideable: true,
  }
},

The collapseSidebarButton is displayed incorrectly.

Also, after hiding sidebar, the "unhide" button is not available:

I'm installing docusaurus-openapi like plugin (but I've also tried preset with same results):

[
  'docusaurus-plugin-openapi',
  /** @type {import('docusaurus-plugin-openapi').Options} */
  ({
    id: 'api',
    path: 'openapi.yml',
    routeBasePath: '/api',
    sidebarCollapsible: false,
  }),
],

It looks like there is no way to disable hideable sidebar only for single plugin.