[FIX] mail: fix y overflow in chatter

For some font families, there was an y overflow and a scrollbar in the
chatter when inserting an @mention. This was because the font height +
the padding of `a.o_mail_redirect` was greater than the line height.

Added an `overflow-y: hidden;` in the css to fix the issue.

closes odoo/odoo#112153

X-original-commit: 3a40fa55919b5a4befc93beaf212521b61f15085
Signed-off-by: Sébastien Theys (seb) <seb@odoo.com>

addons/mail/static/src/components/message/message.scss

@@ -25,6 +25,7 @@
         // may impact the bullet point (at least it does on Safari).
         max-width: 100%;
         overflow-x: auto;
+        overflow-y: hidden;
 
         // overflow: auto can break rendering of next element of a frequent broken Outlook 365
         // warning table. If detected, we prevent the issue by removing flotation.