[FIX] sms: fix some typos

PURPOSE

Followup of merge 4287481 .

SPECIFICATIONS

Notification type is now a selection -> use 'sms' instead of True;
Fix typo in method renaming not correctly propagated to its view;

LINKS

Task 1922187

addons/sms/models/mail_message.py

@@ -29,7 +29,7 @@ class MailMessage(models.Model):
 
     def _search_has_sms_error(self, operator, operand):
         if operator == '=' and operand:
-            return ['&', ('notification_ids.notification_status', '=', 'exception'), ('notification_ids.notification_type', '=', True)]
+            return ['&', ('notification_ids.notification_status', '=', 'exception'), ('notification_ids.notification_type', '=', 'sms')]
         raise NotImplementedError()
 
     def _format_mail_failures(self):

addons/sms/wizard/sms_cancel_views.xml

@@ -10,7 +10,7 @@
                 <field name="help_message"/>
                 <p>If you want to re-send them, click Cancel now, then click on the notification and review them one by one by clicking on the red icon next to each message.</p>
                 <footer>  
-                    <button string="Discard delivery failures" name="cancel_resend_action" type="object" class="btn-primary" />
+                    <button string="Discard delivery failures" name="action_cancel" type="object" class="btn-primary" />
                     <button string="Cancel" class="btn-secondary" special="cancel" />
                 </footer>
             </form>