Explodes device.dmi (#80025)

## About The Pull Request

I woke up today and thought 'what would be easy thing to do today so I
can say I've done something?'. Then I remembered I saw several gangtool
usages the time I split radio up, and I could remedy those. 7 hours
later, device.dmi is split in a folder of its own, and I've also given
unique sprites to door remotes and landing desginators.


## Why It's Good For The Game

The device.dmi was kind of a mess.

## Changelog

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code/modules/mapping/modular_map_loader/modular_map_loader.dm

@@ -1,6 +1,6 @@
 /obj/modular_map_root
 	invisibility = INVISIBILITY_ABSTRACT
-	icon = 'icons/obj/device.dmi'
+	icon = 'icons/obj/devices/tracker.dmi'
 	icon_state = "pinonclose"
 
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF
@@ -70,7 +70,7 @@ INITIALIZE_IMMEDIATE(/obj/modular_map_root)
 
 /obj/modular_map_connector
 	invisibility = INVISIBILITY_ABSTRACT
-	icon = 'icons/obj/device.dmi'
+	icon = 'icons/obj/devices/tracker.dmi'
 	icon_state = "pinonclose"
 
 	resistance_flags = INDESTRUCTIBLE | LAVA_PROOF | FIRE_PROOF | UNACIDABLE | ACID_PROOF