Fixes invisible tram platform [NO GBP] (#72952)

## About The Pull Request
Adds titanium plating underneath the walls of the tram, so that when
they're blown up or dismantled you don't have a near-invisible tram
carrying things in its old footprint.
## Why It's Good For The Game
See picture: You can build machines, chairs, drop objects like any
regular turf, When you smash/tear down the tram walls you're currently
left with near invisible floating tiles that still function as tram,
moving the objects along with it.

Before:

![image](https://user-images.githubusercontent.com/83487515/214501612-a3e656ba-a863-4e01-b0f1-b8ffe8ddd5b6.png)

After:

![image](https://user-images.githubusercontent.com/83487515/214501622-1fa05b19-f9e9-4472-b9f5-81c37d7a283c.png)
## Changelog
🆑 LT3
fix: Tram platform no longer magically levitates objects when the tram
walls are destroyed or dismantled
/🆑

_maps/map_files/tramstation/tramstation.dmm

@@ -6189,11 +6189,6 @@
 "cmr" = (
 /turf/open/floor/iron/stairs/medium,
 /area/station/engineering/transit_tube)
-"cmw" = (
-/obj/structure/industrial_lift/tram/white,
-/obj/structure/tramwall/titanium,
-/turf/open/openspace,
-/area/station/hallway/primary/tram/center)
 "cnv" = (
 /obj/effect/turf_decal/trimline/purple/filled/corner{
 	dir = 4
@@ -29771,7 +29766,7 @@
 /turf/open/floor/iron,
 /area/station/cargo/miningdock/cafeteria)
 "kOp" = (
-/obj/structure/industrial_lift/tram/subfloor,
+/obj/structure/industrial_lift/tram/subfloor/window,
 /obj/structure/window/reinforced/shuttle/tram,
 /obj/structure/fluff/tram_rail{
 	dir = 1
@@ -31553,7 +31548,7 @@
 /turf/open/floor/carpet,
 /area/station/service/theater)
 "lsm" = (
-/obj/structure/industrial_lift/tram/subfloor,
+/obj/structure/industrial_lift/tram/subfloor/window,
 /obj/structure/window/reinforced/shuttle/tram,
 /obj/machinery/computer/tram_controls/directional/south,
 /turf/open/openspace,
@@ -36799,7 +36794,7 @@
 /turf/open/floor/iron/white,
 /area/station/security/execution/education)
 "njl" = (
-/obj/structure/industrial_lift/tram/subfloor,
+/obj/structure/industrial_lift/tram/subfloor/window,
 /obj/structure/fluff/tram_rail,
 /obj/structure/window/reinforced/shuttle/tram,
 /turf/open/openspace,
@@ -40234,7 +40229,7 @@
 /turf/open/floor/iron,
 /area/station/hallway/secondary/command)
 "oAj" = (
-/obj/structure/industrial_lift/tram/subfloor,
+/obj/structure/industrial_lift/tram/subfloor/window,
 /obj/structure/window/reinforced/shuttle/tram,
 /obj/machinery/computer/tram_controls/directional/north,
 /turf/open/openspace,
@@ -51850,7 +51845,7 @@
 /turf/open/floor/iron/dark/telecomms,
 /area/station/tcommsat/server)
 "sFS" = (
-/obj/structure/industrial_lift/tram/subfloor,
+/obj/structure/industrial_lift/tram/subfloor/window,
 /obj/structure/fluff/tram_rail{
 	dir = 1
 	},
@@ -65905,7 +65900,7 @@
 /turf/open/floor/iron/grimy,
 /area/station/service/chapel/office)
 "xIl" = (
-/obj/structure/industrial_lift/tram/subfloor,
+/obj/structure/industrial_lift/tram/subfloor/window,
 /obj/structure/window/reinforced/shuttle/tram,
 /turf/open/floor/noslip/tram_plate,
 /area/station/hallway/primary/tram/center)
@@ -166285,7 +166280,7 @@ izU
 vtp
 dUC
 cRU
-cmw
+kwA
 njl
 xIl
 sFS

code/modules/industrial_lift/tram_override_objects.dm

@@ -27,6 +27,11 @@
 	. = ..()
 	RemoveElement(/datum/element/atmos_sensitive, mapload)
 
+/obj/structure/industrial_lift/tram/subfloor/window
+	name = "tram"
+	desc = "A tram for tramversing the station."
+	icon_state = "tram_subfloor_window"
+
 /obj/structure/chair/sofa/bench/tram
 	greyscale_colors = "#00CCFF"