Fixing the Direct Deals example.

Reviewed in https://codereview.appspot.com/81520043/
diff --git a/samples/adexchangebuyer/get_direct_deals.py b/samples/adexchangebuyer/get_direct_deals.py
index e208448..518d1a8 100644
--- a/samples/adexchangebuyer/get_direct_deals.py
+++ b/samples/adexchangebuyer/get_direct_deals.py
@@ -37,8 +37,8 @@
   try:
     # Retrieve direct deals and display them as received if any.
     result = service.directDeals().list().execute()
-    if 'direct_deals' in result:
-      deals = result['direct_deals']
+    if 'directDeals' in result:
+      deals = result['directDeals']
       for deal in deals:
         pprint.pprint(deal)
     else: