[FIX] sale: send email quotations to contact, not invoice address

addons/sale/data/mail_template_data.xml

@@ -7,7 +7,7 @@
             <field name="name">Sales Order - Send by Email</field>
             <field name="email_from">${(object.user_id.email and '%s &lt;%s&gt;' % (object.user_id.name, object.user_id.email) or '')|safe}</field>
             <field name="subject">${object.company_id.name} ${object.state in ('draft', 'sent') and 'Quotation' or 'Order'} (Ref ${object.name or 'n/a' })</field>
-            <field name="partner_to">${object.partner_invoice_id.id}</field>
+            <field name="partner_to">${object.partner_id.id}</field>
             <field name="model_id" ref="sale.model_sale_order"/>
             <field name="auto_delete" eval="True"/>
             <field name="report_template" ref="report_sale_order"/>