slapos_cloud: drop template_pre_payment_subscription_sale_invoice_transaction

master/bt5/slapos_cloud/PreferenceTemplateItem/portal_preferences/slapos_default_system_preference.xml

@@ -131,10 +131,6 @@
             <key> <string>preferred_credential_request_automatic_approval</string> </key>
             <value> <int>1</int> </value>
         </item>
-        <item>
-            <key> <string>preferred_default_pre_payment_subscription_invoice_template</string> </key>
-            <value> <string>accounting_module/template_pre_payment_subscription_sale_invoice_transaction</string> </value>
-        </item>
         <item>
             <key> <string>preferred_default_pre_payment_template</string> </key>
             <value>