The WebsiteAnimate option was triggering a resize on the window in its
start method, which would lead to a scroll on the wrapwrap and closing
the megamenu dropdown if it was open. Besides that, animations were not
working when selected on a section in a dropdown menu.
Now, an open dropdown that has animated content is considered as the
scrolling element so that its animations are rendered correctly and it
is not closed because of a scroll elsewhere.
The "Launch animation at first time/always" option is hidden for
dropdowns as bootstrap will launch it anytime a dropdown is open.
Part of https://github.com/odoo/odoo/pull/71143
task-2502208
closesodoo/odoo#71143
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>