Minor edits to Clown Biodome ruin (moves a chasm tile) (#67677)

Makes the outside parts symmetrical because that seemed to be the intent of them.
The single lone chasm tile is hard to see and kind of lame to fall into, even for chasm tiles in general.

_maps/RandomRuins/LavaRuins/lavaland_biodome_clown_planet.dmm

@@ -704,6 +704,7 @@
 /area/ruin/powered/clownplanet)
 "Or" = (
 /obj/machinery/light/directional/east,
+/obj/effect/mapping_helpers/no_lava,
 /turf/open/misc/asteroid/basalt/lava_land_surface,
 /area/ruin/powered/clownplanet)
 "QT" = (
@@ -1779,7 +1780,7 @@ cc
 cc
 Zg
 QT
-QT
+gX
 QT
 QT
 gX
@@ -1813,7 +1814,7 @@ aa
 aa
 aa
 QT
-gX
+QT
 QT
 QT
 QT