Refactor sync_nightvision_screen() into sync_lighting_plane_alpha()

Done to avoid having to manually write in the call of the proc since it is needed everywhere sync_lighting_plane_alph() is anyhow.

code/modules/mob/living/carbon/alien/alien.dm

@@ -301,5 +301,4 @@ Des: Removes all infected images from the alien.
 			lighting_alpha = min(lighting_alpha, E.lighting_alpha)
 
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_SIGHT)
-	sync_lighting_plane_alpha()
-	sync_nightvision_screen()
+	sync_lighting_plane_alpha()

code/modules/mob/living/carbon/carbon.dm

@@ -1165,4 +1165,3 @@ so that different stomachs can handle things in different ways VB*/
 
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_SIGHT)
 	sync_lighting_plane_alpha()
-	sync_nightvision_screen()

code/modules/mob/living/carbon/human/human.dm

@@ -567,7 +567,6 @@
 	dna.species.update_sight(src)
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_SIGHT)
 	sync_lighting_plane_alpha()
-	sync_nightvision_screen()
 
 //Added a safety check in case you want to shock a human mob directly through electrocute_act.
 /mob/living/carbon/human/electrocute_act(shock_damage, obj/source, siemens_coeff = 1, safety = FALSE, override = FALSE, tesla_shock = FALSE, illusion = FALSE, stun = TRUE)

code/modules/mob/living/carbon/human/species/_species.dm

@@ -717,7 +717,6 @@ It'll return null if the organ doesn't correspond, so include null checks when u
 		H.sight |= (SEE_TURFS|SEE_MOBS|SEE_OBJS)
 
 	H.sync_lighting_plane_alpha()
-	H.sync_nightvision_screen()
 
 /datum/species/proc/water_act(mob/living/carbon/human/M, volume, temperature, source)
 	if(abs(temperature - M.bodytemperature) > 10) //If our water and mob temperature varies by more than 10K, cool or/ heat them appropriately

code/modules/mob/living/life.dm

@@ -235,7 +235,6 @@
 	see_in_dark = 8
 	see_invisible = SEE_INVISIBLE_OBSERVER
 	sync_lighting_plane_alpha()
-	sync_nightvision_screen()
 
 /mob/living/proc/handle_hud_icons()
 	handle_hud_icons_health()

code/modules/mob/living/silicon/ai/ai.dm

@@ -1314,4 +1314,3 @@ var/list/ai_verbs_default = list(
 
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_SIGHT)
 	sync_lighting_plane_alpha()
-	sync_nightvision_screen()

code/modules/mob/living/silicon/robot/robot.dm

@@ -1453,5 +1453,4 @@ var/list/robot_verbs_default = list(
 
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_SIGHT)
 	sync_lighting_plane_alpha()
-	sync_nightvision_screen()
-	
+	

code/modules/mob/mob.dm

@@ -1357,7 +1357,6 @@ var/list/slot_equipment_priority = list( \
 /mob/proc/update_sight()
 	SEND_SIGNAL(src, COMSIG_MOB_UPDATE_SIGHT)
 	sync_lighting_plane_alpha()
-	sync_nightvision_screen()
 
 /mob/proc/sync_lighting_plane_alpha()
 	if(hud_used)
@@ -1365,6 +1364,8 @@ var/list/slot_equipment_priority = list( \
 		if(L)
 			L.alpha = lighting_alpha
 
+	sync_nightvision_screen() //Sync up the overlay used for nightvision to the amount of see_in_dark a mob has. This needs to be called everywhere sync_lighting_plane_alpha() is.
+
 /mob/proc/sync_nightvision_screen()
 	var/obj/screen/fullscreen/see_through_darkness/S = screens["see_through_darkness"]
 	if(S)