[FIX] website_slide: avoid traceback when channel not readable
[FIX] website_slide: avoid traceback when channel not readable

If the user has limited_access, download_security field was not read due to the
override of check_field_access_rights and so the field not set.
When you try to access/read it, you got: Selection is not iterable.

Now we check in sudo the download_security.

We also add the **kw that should be present in all routes.
Avoid: "slide_download() got an unexpected keyword argument 'debug'"

We also remove this controller from the sitemap.

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