[IMP] mass_mailing_sms: Add missing field in form

Followup on https://github.com/odoo/odoo/commit/14648272dadfbc9e2c7069de76770d5c052cd37f
Field failure_type was visible on the list view only.
In this commit, we display field on form view as well.

closes odoo/odoo#42987

X-original-commit: 5c3c61014d7af995cd54d35aa769e8d92352a531
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>

addons/mass_mailing_sms/views/mailing_trace_views.xml

@@ -111,6 +111,7 @@
                             <field name="clicked"/>
                             <field name="bounced"/>
                             <field name="exception"/>
+                            <field name="failure_type" attrs="{'invisible': [('exception', '=', False)]}"/>
                             <field name="ignored"/>
                         </group>
                     </group>