Removes the construct shell from the beach gateway (#16024)

* Removes the construct shell from the beach gateway

* Map merged™️

_maps/map_files/RandomZLevels/beach.dmm

@@ -18,10 +18,6 @@
 	},
 /turf/simulated/floor/beach/away/water/deep/sand_floor,
 /area/awaymission/undersea)
-"af" = (
-/obj/structure/constructshell,
-/turf/simulated/floor/beach/away/water/deep/wood_floor,
-/area/awaymission/undersea)
 "ag" = (
 /obj/structure/chair/wood/wings,
 /turf/simulated/floor/beach/away/water/deep/wood_floor,
@@ -46312,7 +46308,7 @@ ad
 ad
 ad
 ah
-af
+ah
 ah
 ah
 ar
@@ -46823,7 +46819,7 @@ av
 av
 ad
 ad
-af
+ah
 ah
 ah
 ah
@@ -48108,7 +48104,7 @@ av
 av
 ad
 ad
-af
+ah
 ah
 ah
 ah
@@ -48625,7 +48621,7 @@ ad
 ad
 ad
 ah
-af
+ah
 ah
 ah
 ah