Let's remove the path controller when we cancel our move

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@111 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/jme/sprite/Sprite.java

@@ -146,6 +146,7 @@ public class Sprite extends Node
         if (_path != null) {
             Path oldpath = _path;
             _path = null;
+            removeController(oldpath);
             oldpath.wasRemoved();
             if (_observers != null) {
                 _observers.apply(new CancelledOp(this, oldpath));