Kills airlocks lights (#5309)

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## About The Pull Request
airlocks update their lights every time it calls update_overlays which
seems pretty often, perf-wise this doesn't seem worth it with how common
they are, i don't think they contribute much
Keep in mind, this keeps the emissives and overlays and whatever, and
only removes the outward lights emitting from the airlock
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## Why It's Good For The Game
tracy told us that lightning can use a helluvalot of time (old trace
though)
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## Proof Of Testing
um
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## Changelog

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🆑
del: for performance reasons, airlocks no longer emit their own lights
/🆑

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---------

Co-authored-by: Alexis <catmc8565@gmail.com>

code/__DEFINES/~skyrat_defines/airlock.dm

@@ -1,6 +1,5 @@
 
 
-#define AIRLOCK_LIGHT_POWER 0.5
 #define AIRLOCK_LIGHT_RANGE 2
 #define AIRLOCK_LIGHT_ENGINEERING "engineering"
 #define AIRLOCK_LIGHT_FIRE "fire"

modular_skyrat/modules/aesthetics/airlock/code/airlock.dm

@@ -35,7 +35,6 @@
 	. = ..()
 	var/frame_state
 	var/light_state = AIRLOCK_LIGHT_POWERON
-	var/pre_light_color
 	if(machine_stat & MAINT) // in the process of being emagged
 		frame_state = AIRLOCK_FRAME_CLOSED
 	else switch(airlock_state)
@@ -43,53 +42,38 @@
 			frame_state = AIRLOCK_FRAME_CLOSED
 			if(locked)
 				light_state = AIRLOCK_LIGHT_BOLTS
-				pre_light_color = AIRLOCK_BOLTS_LIGHT_COLOR
 			else if(emergency)
 				light_state = AIRLOCK_LIGHT_EMERGENCY
-				pre_light_color = AIRLOCK_EMERGENCY_LIGHT_COLOR
 			else if(has_active_reta_access())
 				light_state = AIRLOCK_LIGHT_RETA
-				pre_light_color = AIRLOCK_RETA_LIGHT_COLOR
 			else if(fire_active)
 				light_state = AIRLOCK_LIGHT_FIRE
-				pre_light_color = AIRLOCK_FIRE_LIGHT_COLOR
 			else if(engineering_override)
 				light_state = AIRLOCK_LIGHT_ENGINEERING
-				pre_light_color = AIRLOCK_ENGINEERING_LIGHT_COLOR
-			else
-				pre_light_color = AIRLOCK_POWERON_LIGHT_COLOR
+
 		if(AIRLOCK_DENY)
 			frame_state = AIRLOCK_FRAME_CLOSED
 			light_state = AIRLOCK_LIGHT_DENIED
-			pre_light_color = AIRLOCK_DENY_LIGHT_COLOR
 		if(AIRLOCK_CLOSING)
 			frame_state = AIRLOCK_FRAME_CLOSING
 			light_state = AIRLOCK_LIGHT_CLOSING
-			pre_light_color = AIRLOCK_ACCESS_LIGHT_COLOR
 		if(AIRLOCK_OPEN)
 			frame_state = AIRLOCK_FRAME_OPEN
 			if(locked)
 				light_state = AIRLOCK_LIGHT_BOLTS
-				pre_light_color = AIRLOCK_BOLTS_LIGHT_COLOR
 			else if(emergency)
 				light_state = AIRLOCK_LIGHT_EMERGENCY
-				pre_light_color = AIRLOCK_EMERGENCY_LIGHT_COLOR
 			else if(has_active_reta_access())
 				light_state = AIRLOCK_LIGHT_RETA
-				pre_light_color = AIRLOCK_RETA_LIGHT_COLOR
 			else if(fire_active)
 				light_state = AIRLOCK_LIGHT_FIRE
-				pre_light_color = AIRLOCK_FIRE_LIGHT_COLOR
 			else if(engineering_override)
 				light_state = AIRLOCK_LIGHT_ENGINEERING
-				pre_light_color = AIRLOCK_ENGINEERING_LIGHT_COLOR
-			else
-				pre_light_color = AIRLOCK_POWERON_LIGHT_COLOR
+
 			light_state += "_open"
 		if(AIRLOCK_OPENING)
 			frame_state = AIRLOCK_FRAME_OPENING
 			light_state = AIRLOCK_LIGHT_OPENING
-			pre_light_color = AIRLOCK_ACCESS_LIGHT_COLOR
 
 	. += get_airlock_overlay(frame_state, icon, src, em_block = TRUE)
 	if(airlock_material)
@@ -101,13 +85,6 @@
 		. += get_airlock_overlay("lights_[light_state]", overlays_file, src, em_block = FALSE)
 		. += emissive_appearance(overlays_file, "lights_[light_state]", src, alpha = src.alpha)
 
-		if(multi_tile && filler)
-			filler.set_light(l_range = AIRLOCK_LIGHT_RANGE, l_power = AIRLOCK_LIGHT_POWER, l_color = pre_light_color, l_on = TRUE)
-
-		set_light(l_range = AIRLOCK_LIGHT_RANGE, l_power = AIRLOCK_LIGHT_POWER, l_color = pre_light_color, l_on = TRUE)
-	else
-		set_light(l_on = FALSE)
-
 	if(greyscale_accent_color)
 		. += get_airlock_overlay("[frame_state]_accent", overlays_file, src, em_block = TRUE, state_color = greyscale_accent_color)