[FIX] mail: invalid url regex

Since [1], comma can be included in url by the discuss regex. This
should not be the case if the comma is at the end of the url/line
since it could be part of a sentance.

This PR applies the same logic to the dot and the semicolon character
since they could also be used as punctuation.

[1] https://github.com/odoo/odoo/pull/122093



closes odoo/odoo#122227

Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>