Optimize anchor identifiers.

Assets/Cryville/Crtr/TrackHandler.cs

@@ -107,9 +107,9 @@ namespace Cryville.Crtr {
 		}
 
 		public override void EndUpdate(ContainerState s) {
-			OpenAnchor("tail");
+			OpenAnchor(_a_tail);
 			base.EndUpdate(s);
-			CloseAnchor("tail");
+			CloseAnchor(_a_tail);
 			if (s.CloneType == 0 || s.CloneType == 2) {
 				EndUpdatePosition(ts);
 				var p = GetCurrentWorldPoint();