Fix the lobby art not fading out (#91637)

## About The Pull Request

ports a fix from
https://github.com/Monkestation/Monkestation2.0/pull/6991

https://github.com/tgstation/tgstation/pull/76772 accidentally broke
most instances of using `/atom/movable/screen/splash`, bc now the client
needs to be third instead of second argument to `new
/atom/movable/screen/splash`... yeah.

<details>
<summary><h3>pre-fix video clip</h3></summary>


https://github.com/user-attachments/assets/87015373-de72-4753-bf6e-55c3d9ffa207

</details>

<details>
<summary><h3>post-fix video clip</h3></summary>


https://github.com/user-attachments/assets/3dc80c68-f4a5-44a7-95fe-d590affc273d

</details>

## Why It's Good For The Game

bugfix good

## Changelog
🆑
fix: The lobby art properly fades out during roundstart, latejoin, and
server restart again.
/🆑

code/modules/mob/dead/dead.dm

@@ -76,7 +76,7 @@ INITIALIZE_IMMEDIATE(/mob/dead)
 
 	var/client/hopper = client
 	to_chat(hopper, span_notice("Sending you to [pick]."))
-	var/atom/movable/screen/splash/fade_in = new(null, src, hopper, FALSE)
+	var/atom/movable/screen/splash/fade_in = new(null, null, src, hopper, FALSE)
 	fade_in.Fade(FALSE)
 
 	ADD_TRAIT(src, TRAIT_NO_TRANSFORM, SERVER_HOPPER_TRAIT)