Fix incorrect Prevent Action special nodes in the scenarios, caused by incorrect import code

The fix was implemented by re-importing the legacy scenarios and re-exporting them,
then simply accepting any changes to a Prevent Action node.

rsrc/scenarios/zakhazi/towns/town8.spec

@@ -170,7 +170,7 @@
 	sdf -1, -1
 	msg 44, 45, -1
 	pic 0, 4
-	ex1 0, -1, -1
+	ex1 1, -1, -1
 	ex2 0, -1, -1
 	goto -1
 @disp-msg = 25
@@ -191,7 +191,7 @@
 	sdf -1, -1
 	msg 46, 47, -1
 	pic 0, 4
-	ex1 0, -1, -1
+	ex1 1, -1, -1
 	ex2 0, -1, -1
 	goto 28
 @status = 28