RateLimitUploadPackIT: Remove duplication for username

Change-Id: I4d13ea45f67227c2250b55deb7e0632494035522
diff --git a/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java b/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java
index 7724d9e..7914376 100644
--- a/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java
+++ b/src/test/java/com/googlesource/gerrit/plugins/ratelimiter/RateLimitUploadPackIT.java
@@ -35,7 +35,7 @@
   public void setUp() throws Exception {
     // Create the group before the plugin is loaded since limits per group are
     // resolved at plugin load time.
-    addUserToNewGroup("user", "limitGroup");
+    addUserToNewGroup(user.username, "limitGroup");
     super.setUp();
   }