Reverts Strongdmm Visual Patch (tgstation#84705)

## About The Pull Request

I got a fix merged to the tool (and _spair cut a new release), so
there's no reason to shim around it not working anymore.

In context of tgstation#84659 reverts tgstation#84659

code/__DEFINES/layers.dm

@@ -119,11 +119,6 @@
 /// Try and keep this to a nice whole number, so it's easy to look at a plane var and know what's going on
 #define PLANE_RANGE (HIGHEST_EVER_PLANE - LOWEST_EVER_PLANE)
 
-// Layer helper macros
-
-/// Gives us a way to hook into topdown layers so we can make stupid DUMBASS MAP EDITOR RENDERING happy
-#define MARK_TOPDOWN(layer, FLOOR, NORMALIZED, MAX) MAP_SWITCH(layer, ( ( (NORMALIZED) - (FLOOR) ) * ( ( (layer) - TOPDOWN_LAYER ) / (MAX) ) ) + (FLOOR))
-
 // PLANE_SPACE layer(s)
 #define SPACE_LAYER 1.8
 
@@ -137,30 +132,22 @@
 // this allows larger then bound floors to layer as we'd expect
 // ANYTHING on the floor plane needs TOPDOWN_LAYER, and nothing that isn't on the floor plane can have it
 
-/// Max floor plane layer value (ignoring topdown)
-#define MAX_FLOOR_LAYER 13
-/// The minimum layer floor plane should have normalized to match up with its position in the plane stack
-#define MAPPING_FLOOR_LAYER_NORMALIZED_MIN 1.81
-/// The max layer floor plane should have normalized to match up with its position in the plane stack
-#define MAPPING_FLOOR_LAYER_NORMALIZED_MAX 2
-#define MARK_FLOOR_LAYER(layer) MARK_TOPDOWN(layer, MAPPING_FLOOR_LAYER_NORMALIZED_MIN, MAPPING_FLOOR_LAYER_NORMALIZED_MAX, MAX_FLOOR_LAYER)
-
 // NOTICE: we break from the pattern of increasing in steps of like 0.01 here
 // Because TOPDOWN_LAYER is 10000 and that's enough to floating point our modifications away
-#define LOW_FLOOR_LAYER MARK_FLOOR_LAYER(1 + TOPDOWN_LAYER)
-#define TURF_PLATING_DECAL_LAYER MARK_FLOOR_LAYER(2 + TOPDOWN_LAYER)
-#define TURF_DECAL_LAYER MARK_FLOOR_LAYER(3 + TOPDOWN_LAYER) //Makes turf decals appear in DM how they will look inworld.
-#define CULT_OVERLAY_LAYER MARK_FLOOR_LAYER(4 + TOPDOWN_LAYER)
-#define MID_TURF_LAYER MARK_FLOOR_LAYER(5 + TOPDOWN_LAYER)
-#define HIGH_TURF_LAYER MARK_FLOOR_LAYER(6 + TOPDOWN_LAYER)
-#define LATTICE_LAYER MARK_FLOOR_LAYER(7 + TOPDOWN_LAYER)
-#define DISPOSAL_PIPE_LAYER MARK_FLOOR_LAYER(8 + TOPDOWN_LAYER)
-#define WIRE_LAYER MARK_FLOOR_LAYER(9 + TOPDOWN_LAYER)
-#define GLASS_FLOOR_LAYER MARK_FLOOR_LAYER(10 + TOPDOWN_LAYER)
-#define TRAM_RAIL_LAYER MARK_FLOOR_LAYER(11 + TOPDOWN_LAYER)
+#define LOW_FLOOR_LAYER (1 + TOPDOWN_LAYER)
+#define TURF_PLATING_DECAL_LAYER (2 + TOPDOWN_LAYER)
+#define TURF_DECAL_LAYER (3 + TOPDOWN_LAYER) //Makes turf decals appear in DM how they will look inworld.
+#define CULT_OVERLAY_LAYER (4 + TOPDOWN_LAYER)
+#define MID_TURF_LAYER (5 + TOPDOWN_LAYER)
+#define HIGH_TURF_LAYER (6 + TOPDOWN_LAYER)
+#define LATTICE_LAYER (7 + TOPDOWN_LAYER)
+#define DISPOSAL_PIPE_LAYER (8 + TOPDOWN_LAYER)
+#define WIRE_LAYER (9 + TOPDOWN_LAYER)
+#define GLASS_FLOOR_LAYER (10 + TOPDOWN_LAYER)
+#define TRAM_RAIL_LAYER (11 + TOPDOWN_LAYER)
 ///catwalk overlay of /turf/open/floor/plating/catwalk_floor
-#define CATWALK_LAYER MARK_FLOOR_LAYER(12 + TOPDOWN_LAYER)
-#define ABOVE_OPEN_TURF_LAYER MARK_FLOOR_LAYER(13 + TOPDOWN_LAYER)
+#define CATWALK_LAYER (12 + TOPDOWN_LAYER)
+#define ABOVE_OPEN_TURF_LAYER (13 + TOPDOWN_LAYER)
 
 //WALL_PLANE layers
 #define BELOW_CLOSED_TURF_LAYER 2.053