Fix some deprecation warnings with Interval.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6764 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/main/java/com/threerings/presents/server/RebootManager.java

@@ -266,7 +266,7 @@ public abstract class RebootManager
             broadcast("m.rebooting_now");
 
             // wait 1 second, then do it
-            new Interval() { // Note: This interval does not run on the dobj thread
+            new Interval(Interval.RUN_DIRECT) {
                 @Override public void expired () {
                     _server.queueShutdown(); // this posts a LongRunnable
                 }