[FIX] sale: missing field in quotation report

Before this commit, the field validity_date was missing from the
default quotation report. Historically this field was added in
module website_quote but it was then moved to sale in
77bd5181f7

The modification on the quotation report related to validity_date
were missed at that time.

This commit adds validity_date to the default quotation report.

addons/sale/report/sale_report_templates.xml

@@ -60,6 +60,10 @@
                     <strong>Payment Terms:</strong>
                     <p t-field="doc.payment_term_id"/>
                 </div>
+                <div t-if="doc.validity_date and doc.state in ['draft', 'sent']" class="col-xs-3">
+                    <strong>Expiration Date:</strong>
+                    <p t-field="doc.validity_date"/>
+                </div>
             </div>
 
             <!-- Is there a discount on at least one line? -->

addons/website_quote/report/sale_order_templates.xml

@@ -1,12 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <odoo>
 <template id="report_saleorder_validity_date" inherit_id="sale.report_saleorder_document">
-    <xpath expr="//div[hasclass('page')]/div[@id='informations']" position="inside">
-        <div t-if="doc.validity_date and doc.state in ['draft', 'sent']" class="col-xs-3">
-            <strong>Expiration Date:</strong>
-            <p t-field="doc.validity_date"/>
-        </div>
-    </xpath>
     <xpath expr="//div[hasclass('page')]/p[@id='fiscal_position_remark']" position="after">
         <div t-if="doc.options and doc.state in ['draft', 'sent']" style="page-break-before:always;">
             <h2>