POLARIS: Fix the seedarkness variable

Now essentially works as a "permanent darksight adjustment" variable, removing the slow change.

code/modules/mob/living/life.dm

@@ -214,6 +214,10 @@
 		return FALSE
 
 /mob/living/proc/handle_darksight()
+	if(!seedarkness) //Cheap 'always darksight' var
+		dsoverlay.alpha = 255
+		return
+
 	var/darksightedness = min(see_in_dark/world.view,1.0)	//A ratio of how good your darksight is, from 'nada' to 'really darn good'
 	var/current = dsoverlay.alpha/255						//Our current adjustedness