fixes parallax whitifier applying when parallax is disabled (#15516)

* :)

* that

* move those there

* refactor that too

* wew

* stuff

* almost.

* sigh

* just need speed

* stuf

* pain

* hm

* tweaks

* that

* eh

* wack

* a

* done

* that's important

* wacky

* all that

* fixes

* typo

* that

* a

* funny

* that

* that

* woo

* help im losing my fucking mind

* okay

* fix

* a

* woops

code/_rendering/parallax/parallax_holder.dm

@@ -174,7 +174,7 @@
 		L.SetView(C.view, TRUE)
 		. |= L
 	C.screen |= .
-	if(!secondary_map)
+	if(!secondary_map && (owner.prefs.parallax != PARALLAX_DISABLE))
 		var/atom/movable/screen/plane_master/parallax_white/PM = locate() in C.screen
 		if(PM)
 			PM.color =  list(