Fix Nebulastation failing unit tests (#3326)

## About The Pull Request

ef3095bffc changed the wiring in the
nebula SM room and our automapper template needs to be updated to
accommodate this

## Why It's Good For The Game

I am hopelessly dependent on the green checkmark

## Proof Of Testing

<details>
<summary>Screenshots/Videos</summary>


![image](https://github.com/user-attachments/assets/6a14199c-faa5-458c-8033-e7afada07a23)

</details>

_maps/bubber/automapper/templates/NebulaStation/nebulastation_supermatter.dmm

@@ -49,6 +49,7 @@
 /obj/effect/turf_decal/stripes/corner{
 	dir = 4
 	},
+/obj/structure/cable/layer1,
 /turf/open/floor/engine,
 /area/station/engineering/supermatter/room)
 "T" = (
@@ -60,6 +61,7 @@
 /area/station/engineering/supermatter/room)
 "V" = (
 /obj/structure/cable,
+/obj/structure/cable/layer1,
 /turf/open/floor/noslip,
 /area/station/engineering/supermatter/room)
 "Y" = (
@@ -70,6 +72,7 @@
 /obj/effect/turf_decal/stripes/corner{
 	dir = 1
 	},
+/obj/structure/cable/layer1,
 /turf/open/floor/engine,
 /area/station/engineering/supermatter/room)