[FIX] web: reduce spacing between toast notifications
[FIX] web: reduce spacing between toast notifications

Currently, toast notifications are too far apart with each other if there are
multiple notifications.

So with this commit, we have reduced the margin from the bottom so it looks
closer.

Task : 2278730

closes odoo/odoo#53071

Signed-off-by: Aaron Bohy (aab) <40b904fd8852297daeaeb426b1bca46fd2454aa3@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo