Log the _username instead of the _clobj which might go away.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4985 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/server/PresentsClient.java

@@ -805,7 +805,7 @@ public class PresentsClient
     {
         buf.append("username=").append(_username);
         buf.append(", conn=").append(_conn);
-        buf.append(", cloid=").append((_clobj == null) ? -1 : _clobj.getOid());
+        buf.append(", who=").append(_username);
         buf.append(", in=").append(_messagesIn);
         buf.append(", out=").append(_messagesOut);
     }