[IMP] website_sale: Added S2S payment with new payment form

- Added the support of form payment.
- Fixed payment form's errors not being displayed.
- Fixed a crash when paying on e-commerce with a saved token.
(dev commit, need to clean the code)

addons/payment_transfer/data/payment_acquirer_data.xml

@@ -7,7 +7,8 @@
             <field name="image" type="base64" file="payment_transfer/static/src/img/transfer_icon.png"/>
             <field name="provider">transfer</field>
             <field name="company_id" ref="base.main_company"/>
-            <field name="view_template_id" ref="transfer_acquirer_button"/>
+            <!-- <field name="view_template_id" ref="transfer_acquirer_button"/> -->
+            <field name="view_template_id" ref="transfer_form"/>
             <field name="environment">test</field>
             <field name="website_published" eval="True"/>
             <field name="pre_msg"><![CDATA[

addons/payment_transfer/views/payment_transfer_templates.xml

@@ -20,6 +20,7 @@
         </template>
 
         <template id="transfer_form">
+            <input type="hidden" name="data_set" t-att-data-action-url="tx_url"/>
             <t t-if="return_url">
                 <input type='hidden' name='return_url' t-att-value='return_url'/>
             </t>