Added IsLeaving() method to custom sandwich lava

Author: maddie480

Entities/CustomSandwichLava.cs

@@ -216,6 +216,10 @@ private void OnPlayer(Player player) {
             }
         }
 
+        public bool IsLeaving() {
+            return leaving;
+        }
+
         public void Leave() {
             AddTag(Tags.TransitionUpdate);
             leaving = true;