[MIRROR] Fixes Railing Endings [MDB IGNORE] (#24621)

* Fixes Railing Endings (#79241)

## About The Pull Request
Fixes #78741 by comparing/contrasting the directions of the new railing
sprites with their original counterparts. Way easier than I was
expecting, but I'm *still* annoyed that the first response to this was
to take on mapping techdebt and start to redo it all manually.
This should *actually* fix every spaceruin, stationmap, etc that use
railings, and reverts the mapping-side changes to railings done on the
beach while I'm at it.

The proof is in the pudding:

![image](https://github.com/tgstation/tgstation/assets/50649185/a0ddd8d4-afb6-42a1-bae0-ce1d905be26b)
## Why It's Good For The Game
Completely glasses a source of mapping techdebt from the face of the
earth without resorting to updatepaths.
## Changelog
🆑
fix: Every misaligned railing ending has been corrected by the
Nanotrasen Hall Monitor's Lunchclub.
/🆑

* Fixes Railing Endings

---------

Co-authored-by: BluBerry016 <50649185+unit0016@users.noreply.github.com>

_maps/RandomZLevels/TheBeach.dmm

@@ -877,7 +877,7 @@
 /turf/open/floor/eighties,
 /area/awaymission/beach)
 "lb" = (
-/obj/structure/railing/corner/end{
+/obj/structure/railing/corner/end/flip{
 	dir = 4
 	},
 /turf/open/floor/wood/parquet,
@@ -1758,7 +1758,7 @@
 	pixel_y = -8;
 	pixel_x = -3
 	},
-/obj/structure/railing/corner/end{
+/obj/structure/railing/corner/end/flip{
 	dir = 4
 	},
 /turf/open/floor/wood/parquet,
@@ -2619,7 +2619,7 @@
 	pixel_y = -6;
 	pixel_x = -12
 	},
-/obj/structure/railing/corner/end{
+/obj/structure/railing/corner/end/flip{
 	dir = 4
 	},
 /turf/open/floor/wood/parquet,