[FIX] sale: fix report name when sending by email, no more lasting _

addons/sale/data/mail_template_data.xml

@@ -11,7 +11,7 @@
             <field name="model_id" ref="sale.model_sale_order"/>
             <field name="auto_delete" eval="True"/>
             <field name="report_template" ref="report_sale_order"/>
-            <field name="report_name">${(object.name or '').replace('/','_')}_${object.state == 'draft' and 'draft' or ''}</field>
+            <field name="report_name">${(object.name or '').replace('/','_')}${object.state == 'draft' and '_draft' or ''}</field>
             <field name="lang">${object.partner_id.lang}</field>
             <field name="body_html"><![CDATA[
 <p>Dear ${object.partner_id.name}