[FIX] web: remove 'overlay' overflow on modals

The o-scrollbar-overlay mixin was introduced for a fix on the enterprise
home menu (see related commit in enterprise that comes with this PR).
It was used on modal elements at the same time for no apparent reason:
the modal in the backend do not even scroll as this is their modal-body
that does.

This now introduced a bug in the frontend: some code which allows to
scroll to an element in a modal was not working on chrome because the
related code was checking for the element with 'overflow: auto'... which
it could not find since that element uses 'overflow: overlay'. As
overlay is a deprecated value, it seemed better to remove its use rather
than adapt the frontend code expecting the 'auto' value. This also solve
a design inconsistency between Chrome and Firefox (where the overlay
value is simply ignored).

closes odoo/odoo#58444

Related: odoo/enterprise#13524
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>

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