Infection icon now has lower alpha if the human is dead (#6254)

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# About the pull request
So this was bothering me for a long time and now I finally found a
simple solution.

I cannot make 5 new sprites to display that hugged person is dead.

I cannot change the color of the sprite, as you need to know which hive
larva belongs to.

But I can lower alpha! Simple solution.

# Explain why it's good for the game
Makes it less confusing for both xenos and observers to figure if the
hugged person is dead. Sometimes xenos ignore people who stepped in a
resin trap because they assume that the person is dead, why would the
person be lying in the middle of nowhere otherwise?

# Testing Photographs and Procedure
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functioning successfully, ideally including edge cases. -->

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![2024-05-07_06-35-46](https://github.com/cmss13-devs/cmss13/assets/115417687/0435546e-f627-4588-a110-387ddfd204ab)

![2024-05-07_06-33-55](https://github.com/cmss13-devs/cmss13/assets/115417687/93ed864a-9b9c-4abf-a64a-532b7c67e686)



# Changelog

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:cl: ihatethisengine
add: Infection icon now has lower alpha if the human is dead
/:cl:

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code/datums/mob_hud.dm

@@ -422,6 +422,12 @@ GLOBAL_LIST_INIT_TYPED(huds, /datum/mob_hud, list(
 				if(hive && hive.color)
 					holder3.color = hive.color
 
+				if(stat == DEAD || status_flags & FAKEDEATH)
+					holder2.alpha = 100
+					holder3.alpha = 100
+				else
+					holder2.alpha = 255
+					holder3.alpha = 255
 		if(status_flags & CORRUPTED_ALLY)
 			holder4.color = "#80ff80"
 			holder4.icon_state = "hudalien_ally"