[FIX] portal: <body/> should still be the scrolling element
[FIX] portal: <body/> should still be the scrolling element

Commit https://github.com/odoo/odoo/commit/a7a89f31741c3df1d15f1fb8d0433b2761a7e1d0
was a bit too optimistic. Too many features still depend on the scroll
event listened on the <body/> element.

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