[FIX] sale: attachment name

- Create a SO, keep it as draft
- Click on 'Send by Email'

The name of the attached PDF file contains `_draft`.

This doesn't really make sense anymore, since the SO will be set to
'Sent' right after sending. Therefore, if sending a second time,
`_draft` won't be added to the filename.

opw-1930282

closes odoo/odoo#30367

addons/sale/data/mail_data.xml

@@ -102,7 +102,7 @@
 </div>
             </field>
             <field name="report_template" ref="action_report_saleorder"/>
-            <field name="report_name">${(object.name or '').replace('/','_')}${object.state == 'draft' and '_draft' or ''}</field>
+            <field name="report_name">${(object.name or '').replace('/','_')}</field>
             <field name="lang">${object.partner_id.lang}</field>
             <field name="user_signature" eval="False"/>
             <field name="auto_delete" eval="True"/>