Returns Space Z Level Count To 7 (#5864)

## About The Pull Request

[The count was reduced all the way back in 2024 as a way to help server
performance ](https://github.com/Bubberstation/Bubberstation/pull/2510)
however I've been told it might be worth upping again.
## Why It's Good For The Game

People yearn for the space age. Tiding gets boring and there's often not
a lot in a given round, especially when you have stuff like Tarkon that
take up half a large portion of a given z-level.

## Proof Of Testing

The tests don't fail! Might need a test merge to judge the performance
impact at scale if there's still concern.

🆑 Robwo
code: Returned space Z-level count back to 7.
/🆑

---------

Co-authored-by: LT3 <83487515+lessthnthree@users.noreply.github.com>

code/__DEFINES/maps.dm

@@ -182,7 +182,7 @@ Always compile, always use that verb, and always make sure that it works for wha
 #define PLACE_ISOLATED "isolated" //On isolated ruin z level
 
 ///Map generation defines
-#define DEFAULT_SPACE_RUIN_LEVELS 4 // Bubber Edit - ORG: 7
+#define DEFAULT_SPACE_RUIN_LEVELS 7
 #define DEFAULT_SPACE_EMPTY_LEVELS 1
 
 #define BIOME_LOW_HEAT "low_heat"