[MIRROR] Changes HFR corner to use 4-way icons [MDB IGNORE] (#17342)

* Changes HFR corner to use 4-way icons (#71029)

## About The Pull Request
Changes the HFR corner icon and some of the code so that it uses 4-way
icons. Fixes #64729.

The way the icon is currently set up, the cardinal directions are
completely blank and the icons are on the intercardinals only. Because
of this, using the chameleon projector on a HFR corner means you'll be
completely invisible since the player faces cardinals but the HFR corner
doesn't have cardinal sprites.
## Changelog
🆑
fix: fixed an exploit that let you go completely invisible by scanning a
HFR corner with a chameleon projector
/🆑

* Changes HFR corner to use 4-way icons

Co-authored-by: GoblinBackwards <22856555+GoblinBackwards@users.noreply.github.com>

code/modules/atmospherics/machinery/components/fusion/hfr_parts.dm

@@ -407,7 +407,6 @@
 	icon_state_off = "corner_off"
 	icon_state_open = "corner_open"
 	icon_state_active = "corner_active"
-	dir = SOUTHEAST
 
 /obj/item/paper/guides/jobs/atmos/hypertorus
 	name = "paper- 'Quick guide to safe handling of the HFR'"
@@ -490,6 +489,15 @@
 		var/direction = get_dir(src, box)
 		if(box.box_type == "corner")
 			if(ISDIAGONALDIR(direction))
+				switch(direction)
+					if(NORTHEAST)
+						direction = EAST
+					if(SOUTHEAST)
+						direction = SOUTH
+					if(SOUTHWEST)
+						direction = WEST
+					if(NORTHWEST)
+						direction = NORTH
 				box.dir = direction
 				parts |= box
 			continue

code/modules/atmospherics/machinery/components/fusion/hfr_procs.dm

@@ -24,16 +24,16 @@
 				. = FALSE
 			switch(dir)
 				if(SOUTHEAST)
-					if(object.dir != dir)
+					if(object.dir != SOUTH)
 						. = FALSE
 				if(SOUTHWEST)
-					if(object.dir != dir)
+					if(object.dir != WEST)
 						. = FALSE
 				if(NORTHEAST)
-					if(object.dir != dir)
+					if(object.dir != EAST)
 						. = FALSE
 				if(NORTHWEST)
-					if(object.dir != dir)
+					if(object.dir != NORTH)
 						. = FALSE
 			corners |= object
 			continue