[FIX] website: fix footer/header item move

Using the handle to move elements from footer/header anywhere
in the page would make the main element disappear with endless
content loading animation.

The end of the drag and drop executes a serie of methods :

_destroyEditors > cleanForSave > toggleTargetVisibility

Since the "cleaning for save" is called for all snippets and the footer
doesn't contain a 'o_snippet_invisible' class, the "onTargetShow" method
is called... but actually hide the footer because the "onTargetShow"
implementation was so that it clicks on the visibility checkboxes
regardless of its current status.

Part of https://github.com/odoo/odoo/pull/59624
task-2312878

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