Get rid of redundant MyOriginSpawner method and related state

wadsrc/static/zscript/actors/shared/randomspawner.zs

@@ -12,17 +12,7 @@ extend class Actor {
 
 class RandomSpawner : Actor
 {
-
 	const MAX_RANDOMSPAWNERS_RECURSION = 32; // Should be largely more than enough, honestly.
-	Class<Actor> origin; // Keep track of original RandomSpawner.
-
-	private Class<Actor> MyOriginSpawner() {
-		if (origin == null) {
-			return GetClass();
-		}
-
-		return origin;
-	}
 
 	Default
 	{
@@ -248,12 +238,12 @@ class RandomSpawner : Actor
 			if (newmobj.bMissile)
 				newmobj.CheckMissileSpawn(0);
 			// Bouncecount is used to count how many recursions we're in.
-			if (newmobj is 'RandomSpawner') {
+			if (newmobj is 'RandomSpawner') 
 				newmobj.bouncecount = ++bouncecount;
-				RandomSpawner(newmobj).origin = origin != null ? origin : GetClass();
-			} else {
-				newmobj.originSpawner = MyOriginSpawner();
-			}
+
+			// Keep track of this spawner (or a previous one) in the spawned actor.
+			newmobj.originSpawner = GetOriginSpawner();
+
 			// If the spawned actor has either of those flags, it's a boss.
 			if (newmobj.bBossDeath || newmobj.bBoss)
 				boss = true;