[FIX] hr_recruitment: Add back description to message subtype

Reverts 62bf009 as that is causing that no message is posted in the chatter upon creation.
Althought this might have been an issue before, #56631 removed the addition of the "Application created" message in the message body, so now there was nothing adding it, making the message invisible in the chatter.

TT30413

closes odoo/odoo#75978

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

addons/hr_recruitment/data/hr_recruitment_data.xml

@@ -282,6 +282,7 @@
         <field name="res_model">hr.applicant</field>
         <field name="default" eval="False"/>
         <field name="hidden" eval="True"/>
+        <field name="description">Applicant created</field>
     </record>
     <record id="mt_applicant_stage_changed" model="mail.message.subtype">
         <field name="name">Stage Changed</field>