Hotfix: manage group share with a dedicated parameter

Problem

It's not possible to disable the Associate a shared folder in Nextcloud in group edition without disabling the whole nextcloud feature:

{
  "public": {
    "groupPlugins": {
      "nextcloud": {
        "enable": false,
        "URL": "",
        "groupURL": "[NCLOCATOR]/apps/files/?dir=/[NCSHARENAME]",
        "enableChangeName": false
      }
    }
  }
}

Proposal

We could add a new parameter public.groupPlugins.nextcloud.enableGroupShare and use it in addition to current test

Implementation

Added a public.hideGroupPlugins setting. The default is to not hide the checkboxes.