slapos_panel: Jump into instance tree payment if possible

   Prefer use payment page related to the instance tree rather them the generic one, so it reduces confusion.

master/bt5/slapos_panel/SkinTemplateItem/portal_skins/slapos_panel/SubscriptionRequest_jumpToPaymentPage.py

+aggregate_value = context.getAggregateValue()
+
+if aggregate_value.getPortalType() == "Instance Tree":
+  return aggregate_value.Base_redirect(
+    'InstanceTree_viewCreateDirectDepositPaymentTransactionOnSlaposPanelDialog'
+  )
+
 return context.getPortalObject().accounting_module.Base_redirect(
   "AccountingTransactionModule_viewCreateExternalPaymentTransactionOnSlaposPanelDialog")