Actually truncate result list in QueryChanges

Since 536c754edf (Run dashboard queries
in parallel, 2013-09-06) when we truncate the local variable "changes"
we forget to assign it in the list of returned results.

Change-Id: Ic307cb6e2145435759afc65d5d5394d7ab92a831
Signed-off-by: Jonathan Nieder <jrn@google.com>

gerrit-server/src/main/java/com/google/gerrit/server/query/change/QueryChanges.java

@@ -160,6 +160,7 @@ public class QueryChanges implements RestReadView<TopLevelResource> {
         } else {
           changes = changes.subList(0, imp.getLimit());
         }
+        data.set(n, changes);
         more.set(n, true);
       }
     }