Identify ourselves if we turn out to be a long dobj unit.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4830 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/client/Client.java

@@ -390,6 +390,9 @@ public class Client
                 public void expired () {
                     tick();
                 }
+                public String toString () {
+                    return "Client.tickInterval";
+                }
             };
             _tickInterval.schedule(5000L, true);
         }