Fixes broken shadows on 516 (#89280)

## About The Pull Request
Bandaid fix of broken shadows on 516. 
Renamed refresh button to rebuild for consistency in plane debugger
(Edit/Dubug-Planes).
Rebuild now also reapplies parallax, so it will not be turned off after
rebuild.
Closes #89230 
## Why It's Good For The Game
faster 516 adoption
## Changelog
🆑
fix: fixed shadows on 516
/🆑

code/modules/admin/verbs/plane_debugger.dm

@@ -341,7 +341,7 @@
 	var/list/our_planes = group.plane_masters
 
 	switch(action)
-		if("refresh")
+		if("rebuild")
 			group.rebuild_hud()
 		if("reset_mob")
 			set_target(null)