Fixes character selection screen preview (#7016)

# About the pull request
Fixes not seeing the preview in character selection screen
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# Explain why it's good for the game
Fixes a bug
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

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</details>


# Changelog
:cl:
fix: Fixes not being able to see the preview in the character selection
screen
/:cl:

code/game/atoms_movable.dm

@@ -31,6 +31,9 @@
 	///Highest-intensity light affecting us, which determines our visibility.
 	var/affecting_dynamic_lumi = 0
 
+	/// Holds a reference to the emissive blocker overlay
+	var/emissive_overlay
+
 //===========================================================================
 /atom/movable/Destroy(force)
 	for(var/atom/movable/I in contents)
@@ -39,6 +42,7 @@
 		pulledby.stop_pulling()
 	QDEL_NULL(launch_metadata)
 	QDEL_NULL(em_block)
+	QDEL_NULL(emissive_overlay)
 
 	if(loc)
 		loc.on_stored_atom_del(src) //things that container need to do when a movable atom inside it is deleted
@@ -79,45 +83,33 @@
 
 /atom/movable/Initialize(mapload, ...)
 	. = ..()
+
+	update_emissive_block()
+
+	if(opacity)
+		AddElement(/datum/element/light_blocking)
+	if(light_system == MOVABLE_LIGHT)
+		AddComponent(/datum/component/overlay_lighting)
+	if(light_system == DIRECTIONAL_LIGHT)
+		AddComponent(/datum/component/overlay_lighting, is_directional = TRUE)
+
+/atom/movable/proc/update_emissive_block()
+	if(emissive_overlay)
+		overlays -= emissive_overlay
+
 	switch(blocks_emissive)
 		if(EMISSIVE_BLOCK_GENERIC)
 			var/mutable_appearance/gen_emissive_blocker = mutable_appearance(icon, icon_state, plane = EMISSIVE_PLANE, alpha = src.alpha)
 			gen_emissive_blocker.color = GLOB.em_block_color
 			gen_emissive_blocker.dir = dir
 			gen_emissive_blocker.appearance_flags |= appearance_flags
+			emissive_overlay = gen_emissive_blocker
 			overlays += gen_emissive_blocker
 		if(EMISSIVE_BLOCK_UNIQUE)
 			render_target = ref(src)
 			em_block = new(src, render_target)
+			emissive_overlay = em_block
 			overlays += list(em_block)
-	if(opacity)
-		AddElement(/datum/element/light_blocking)
-	if(light_system == MOVABLE_LIGHT)
-		AddComponent(/datum/component/overlay_lighting)
-	if(light_system == DIRECTIONAL_LIGHT)
-		AddComponent(/datum/component/overlay_lighting, is_directional = TRUE)
-
-/*
-
-///Updates this movables emissive overlay
-/atom/movable/proc/update_emissive_block()
-	if(!blocks_emissive)
-		return
-	else if (blocks_emissive == EMISSIVE_BLOCK_GENERIC)
-		var/mutable_appearance/gen_emissive_blocker = emissive_blocker(icon, icon_state, alpha = src.alpha, appearance_flags = src.appearance_flags)
-		gen_emissive_blocker.dir = dir
-	if(blocks_emissive == EMISSIVE_BLOCK_UNIQUE)
-		if(!em_block)
-			render_target = ref(src)
-			em_block = new(src, render_target)
-		return em_block
-
-/atom/movable/update_overlays()
-	. = ..()
-
-	. += update_emissive_block()
-
-*/
 
 /atom/movable/vv_get_dropdown()
 	. = ..()

code/modules/mob/new_player/preferences_setup.dm

@@ -188,6 +188,10 @@
 	var/J = job_pref_to_gear_preset()
 	if(isnull(preview_dummy))
 		preview_dummy = new()
+
+	preview_dummy.blocks_emissive = FALSE
+	preview_dummy.update_emissive_block()
+
 	clear_equipment()
 	if(refresh_limb_status)
 		for(var/obj/limb/L in preview_dummy.limbs)