[FIX] mail: call check_access_rule correctly

Before this commit there was an option to get an error because there is a space after read.
This mistake was introduced by xmo-odoo at 4435170

closes odoo/odoo#62792

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

addons/mail/models/mail_followers.py

@@ -76,7 +76,7 @@ def _check_rights(self):
                 obj.check_access_rule('write')
                 subject = record.channel_id or record.partner_id
                 subject.check_access_rights('read')
-                subject.check_access_rule('read ')
+                subject.check_access_rule('read')
             else:
                 obj.check_access_rights('read')
                 obj.check_access_rule('read')