Separates tabletop/wallmounted ID authorisation panels (#85124)

## About The Pull Request

We have an ID authorisation panel machine used for things like red
alert, where you need to swipe a card in two different places to
validate it.
_Normally_ this is mounted on a wall in an office, but sometimes it is
on a table. We use the same machine code and sprite for both,

This _mostly_ works but is going to become problematic after the
Wallening.
Resultingly, I've added a sprite and typepath for a desktop version.

![image](https://github.com/user-attachments/assets/10c2828e-53fa-44e0-a2fb-d8f65132f6ae)
Wow! (We need desktop buttons too now that I look at this, I hope the
wallening branch already has that!)

This sprite is secretly the wall-mounted version from the Wallening
(made by Imaginos), but flipped upside down so it looks like it is on a
table not a wall. Delightfully devious (and proposed by "Kok0nut" on
discord).

Also as a result of doing this, I've made wallmounted ID card auth
devices _actually_ attach to the wall in terms of "If the wall goes,
they go too". This may or may not be a good idea given that as far as I
can tell they aren't constructible (and probably shouldn't be given that
then you'd just activate both with one ID card all the time) but seems
broadly sensible to me?

## Why It's Good For The Game

Wallmounted devices should generally deconstruct when associated walls
are destroyed.
Tablemounted devices are going to need different visuals to the
wall-mounted versions.

## Changelog

🆑 Jacquerel, Kok0nut, Imaginos
image: Wall-mounted and Table-mounted ID card authorisation machines now
use different sprites
fix: Wall-mounted ID card authorisation devices will now be destroyed if
their wall is destroyed
/🆑

code/modules/security_levels/keycard_authentication.dm

@@ -9,7 +9,7 @@ GLOBAL_DATUM_INIT(keycard_events, /datum/events, new)
 /obj/machinery/keycard_auth
 	name = "Keycard Authentication Device"
 	desc = "This device is used to trigger station functions, which require more than one ID card to authenticate, or to give the Janitor access to a department."
-	icon = 'icons/obj/machines/wallmounts.dmi'
+	icon = 'icons/obj/machines/keycard_auth_table.dmi'
 	icon_state = "auth_off"
 	power_channel = AREA_USAGE_ENVIRON
 	req_access = list(ACCESS_KEYCARD_AUTH)
@@ -23,8 +23,6 @@ GLOBAL_DATUM_INIT(keycard_events, /datum/events, new)
 
 	COOLDOWN_DECLARE(access_grant_cooldown)
 
-MAPPING_DIRECTIONAL_HELPERS(/obj/machinery/keycard_auth, 26)
-
 /obj/machinery/keycard_auth/Initialize(mapload)
 	. = ..()
 	activated = GLOB.keycard_events.addEvent("triggerEvent", CALLBACK(src, PROC_REF(triggerEvent)))
@@ -158,6 +156,16 @@ MAPPING_DIRECTIONAL_HELPERS(/obj/machinery/keycard_auth, 26)
 		if(KEYCARD_BSA_UNLOCK)
 			toggle_bluespace_artillery()
 
+/// Subtype which is stuck to a wall
+/obj/machinery/keycard_auth/wall_mounted
+	icon = 'icons/obj/machines/wallmounts.dmi'
+
+MAPPING_DIRECTIONAL_HELPERS(/obj/machinery/keycard_auth/wall_mounted, 26)
+
+/obj/machinery/keycard_auth/wall_mounted/Initialize(mapload)
+	. = ..()
+	find_and_hang_on_wall()
+
 GLOBAL_VAR_INIT(emergency_access, FALSE)
 /proc/make_maint_all_access()
 	for(var/area/station/maintenance/area in GLOB.areas)