[FIX] mail: test adaptation forward port

We adapted a test in mail in commit be21041f9aa385f2b9ce1b242379bf147c54b158.

Basically, the test only contained mso comments and no regular comment.
While the python code teats them the same, they are not semantically
equivalent as mso comments actually do have side effects in outlook.
The adaptation is to add a regular comment to the test data so that both
comment types are properly covered by the test, even though the result
is technically the same regardless.

This is the only change from this commit that was not yet present in 15.2.

closes odoo/odoo#84786

X-original-commit: 9275b0119ee6bb2e9a4ee5bef66b00e8c2456d3d
Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>

addons/mail/tests/test_mail_composer.py

@@ -20,7 +20,7 @@ class TestMailComposer(MailCommon):
         <!--[if mso]>
             <i style="letter-spacing: 25px; mso-font-width: -100%; mso-text-raise: 30pt;">&nbsp;</i>
         <![endif]-->
-        A link for you!
+        A link for you! <!-- my favorite example -->
         <!--[if mso]>
             <i style="letter-spacing: 25px; mso-font-width: -100%;">&nbsp;</i>
         <![endif]-->