Check for correct vendor_version

Author: hoffmabc

qa/refund_moderated.py

@@ -63,7 +63,7 @@ def run_test(self):
         # post listing to alice
         with open('testdata/'+ self.vendor_version +'/listing.json') as listing_file:
             listing_json = json.load(listing_file, object_pairs_hook=OrderedDict)
-        if self.vendor_version == 4:
+        if self.vendor_version == "v4":
             listing_json["metadata"]["priceCurrency"] = "t" + self.cointype
         else:
             listing_json["item"]["priceCurrency"]["code"] = "t" + self.cointype