Fix a gateway URL issue with the Vendor Payout js.

docs/changelog/7.x.x.txt

@@ -20,6 +20,8 @@
    need to implement the getRssFeedItems method as explained in AssetAspect/RssFeed.pm
  - Survey now shows warnings if bad goto, bad gotoExpressions, no question text, survey looping,
    or no question answers are found.
+ - fixed: Gateway problem with VendorPayout.
+
 7.7.1
  - the AdSku project: create a Sku that allows buyers to purchase advertising in select AdSpaces at selected priorities
  - rfe #9353: Welcome message template (SDH Consulting Group)

www/extras/VendorPayout/vendorPayout.js

@@ -30,7 +30,7 @@ WebGUI.VendorPayout = function ( containerId ) {
     this.container.appendChild( this.payoutDetails );
 
 
-    this.itemBaseUrl = '/?shop=vendor;method=payoutDataAsJSON;';
+    this.itemBaseUrl = '?shop=vendor;method=payoutDataAsJSON;';
 
     // Initialise tables
     this.initialize();