Oops. Fixed memory leak in FrameInterval by calling cancel if we're not repeating.

git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@3794 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/media/FrameInterval.java

@@ -41,6 +41,7 @@ public abstract class FrameInterval
                 _nextTime += _repeatDelay;
             } else {
                 _nextTime = -1;
+                cancel();
             }
             expired();
         }