[no gbp] Fixes runtime in SSstation (#77231)

No excuse, just dumb. Random layer is the randomly generated parallax
layer, which is null 30% of the time, so this would runtime in SSstation
setup in 30% of rounds

Also another thing where I added extra params and didn't add them to the
proc, fucking parallax for some roundstart clients and latejoins

🆑
fix: fixes a runtime in SSstation setup
fix: fixes parallax not rendering correctly for latejoins
/🆑


![image](https://github.com/tgstation/tgstation/assets/7501474/650242f7-bc33-49eb-98d9-d8e3619ab808)

code/controllers/subsystem/processing/station.dm

@@ -21,7 +21,7 @@ PROCESSING_SUBSYSTEM_DEF(station)
 	#endif
 
 	announcer = new announcer() //Initialize the station's announcer datum
-	SSparallax.random_layer.apply_global_effects() //Apply station effects that parallax might have
+	SSparallax.post_station_setup() //Apply station effects that parallax might have
 
 	return SS_INIT_SUCCESS