[FIX] website_sale: avoid duplicated Thanks message

Configure a thanks message on a payment acquirer which has no automatic confirmation (none value)
(The wire Transfer will do)

Make a website sale with that acquirer

When arriving on the confirmation page on the website:

Before this commit:
The thanks message was duplicated: one at the top, just under "transaction is waiting a manual confirmation"
and one at the bottom, where the actual transaction status is displayed

After this commit:
The thanks message just appears at the bottom location

OPW 1787799

addons/website_sale/views/templates.xml

@@ -1567,12 +1567,6 @@
         </t>
         <t t-if="tx_ids and state == 'pending' and validation">
             <p>Your transaction is waiting a manual confirmation.</p>
-            <br />
-            <t t-if="tx_post_msg">
-                <div class="hidden-print">
-                    <t t-raw="tx_post_msg" />
-                </div>
-            </t>
         </t>
         <t t-if="tx_ids and state not in ['done', 'cancel', 'pending', 'authorized']">
             <p>Your transaction is waiting confirmation.</p>