Follow up to cd5dbe2

* Forgot to adjust npctalk's definition.

src/map/script.c

@@ -21985,7 +21985,7 @@ struct script_function buildin_func[] = {
 	BUILDIN_DEF2(atcommand,"charcommand","s"), // [MouseJstr]
 	BUILDIN_DEF(movenpc,"sii?"), // [MouseJstr]
 	BUILDIN_DEF(message,"ss"), // [MouseJstr]
-	BUILDIN_DEF(npctalk,"s"), // [Valaris]
+	BUILDIN_DEF(npctalk,"s?"), // [Valaris]
 	BUILDIN_DEF(mobcount,"ss"),
 	BUILDIN_DEF(getlook,"i?"),
 	BUILDIN_DEF(getsavepoint,"i?"),