[FIX] web: make test pass on chrome 90

The changed test uses the drag&drop helper, and an operation does
not work as expected with the given params on chrome 90. The runbot
currently uses chrome 80, so it is not an issue, but if your chrome
is up-to-date, and you try to run the test suite, this test would
fail.

closes odoo/odoo#69999

X-original-commit: 43994da9980e4133274984f720bb58f3546ea0f9
Signed-off-by: Géry Debongnie (ged) <ged@openerp.com>
Signed-off-by: Aaron Bohy (aab) <aab@odoo.com>