Add arrow to wall spike in ZB config

extras/conf/SRB2-22.cfg

@@ -4191,6 +4191,7 @@ thingtypes
 			sprite = "WSPKALAR";
 			width = 16;
 			height = 14;
+			arrow = 1;
 			flags1text = "[1] Start retracted";
 			flags4text = "[4] Retractable";
 			flags8text = "[8] Intangible";