Corrects an error with emagged medical kiosk boards. (#89790)

## About The Pull Request

Came across this while scrolling, it's a clear and present error likely
due to old copypaste.

The Medical Kiosk board has a similar feature to the cargo console where
if emagged, the emag state is copied over to the circuit board. The
circuit board, however, is typed to literally be a cargo console.
There's no point in it being anything other than a circuitboard path for
adding the appropriate object flag to the item, and reduces blatantly
wrong copypaste.

## Why It's Good For The Game

World's smalled code cleanup. Results in less bad copypaste.

## Changelog

No player facing changes.

code/game/machinery/medical_kiosk.dm

@@ -178,7 +178,7 @@
 			user.visible_message(span_warning("[user] waves a suspicious card by the [src]'s biometric scanner!"))
 		balloon_alert(user, "sensors overloaded")
 	obj_flags |= EMAGGED
-	var/obj/item/circuitboard/computer/cargo/board = circuit
+	var/obj/item/circuitboard/board = circuit
 	board.obj_flags |= EMAGGED //Mirrors emag status onto the board as well.
 	pandemonium = TRUE
 	return TRUE