slapos_subscription_request: factorize some code

master/bt5/slapos_subscription_request/SkinTemplateItem/portal_skins/slapos_subscription_request/SubscriptionRequestModule_requestSubscriptionProxy.py

@@ -85,17 +85,12 @@ if batch_mode:
   return {'subscription' : subscription_request.getRelativeUrl(),
           'payment': payment.getRelativeUrl() }
 
-if target_language == "zh": # Wechat payment
-  def wrapRedirectWithShadow(payment_transaction, web_site):
+def wrapRedirectWithShadow(payment_transaction, web_site):
   # getTotalPayble returns a negative value
   if payment_transaction.PaymentTransaction_getTotalPayablePrice() < 0:
+    if target_language == "zh":
       return payment_transaction.PaymentTransaction_redirectToManualWechatPayment(web_site)
-    return payment_transaction.PaymentTransaction_redirectToManualFreePayment(web_site)
-    
-else: # Payzen payment
-  def wrapRedirectWithShadow(payment_transaction, web_site):
-    # getTotalPayble returns a negative value
-    if payment_transaction.PaymentTransaction_getTotalPayablePrice() < 0:
+    else:
       return payment_transaction.PaymentTransaction_redirectToManualPayzenPayment(web_site)
   return payment_transaction.PaymentTransaction_redirectToManualFreePayment(web_site)