[PORT] Soapbox component fixes (#3318)

* Fixes soapbox hard dels (#85044)

## About The Pull Request


![firefox_P8rmiESgN1](https://github.com/user-attachments/assets/1c8b565f-3b3d-4264-b35a-79d1d056deaf)

Fixes this recently introduced hard del.

## Why It's Good For The Game

Spurious runtimes bgone.

## Changelog

:cl:
fix: fixed a hard del with soapboxes
/:cl:

* Fixes soapbox component sometimes runtiming roundstart due to not unregistering signals (#85937)

## About The Pull Request

sometimes runtimed due to reassigning signals and it has been driving me
insane

## Changelog
:cl:
fix: Fixed soapbox component sometimes runtiming roundstart
/:cl:

* kill me now

---------

Co-authored-by: Bloop <[email protected]>
Co-authored-by: SmArtKar <[email protected]>

code/datums/components/soapbox.dm

@@ -4,7 +4,7 @@
 	/// Gives atoms moving over us the soapbox speech and takes it away when they leave
 	var/static/list/loc_connections = list(
 		COMSIG_ATOM_ENTERED = PROC_REF(on_loc_entered),
-		COMSIG_ATOM_EXITED = PROC_REF(on_loc_exited)
+		COMSIG_ATOM_EXITED = PROC_REF(on_loc_exited),
 	)
 
 /datum/component/soapbox/Initialize(...)
@@ -16,6 +16,8 @@
 ///Applies loud speech to our movable when entering the turf our parent is on
 /datum/component/soapbox/proc/on_loc_entered(datum/source, atom/movable/soapbox_arrive)
 	SIGNAL_HANDLER
+	if(QDELETED(soapbox_arrive) || (soapbox_arrive in soapboxers))
+		return
 	RegisterSignal(soapbox_arrive, COMSIG_MOB_SAY, PROC_REF(soapbox_speech))
 	soapboxers += soapbox_arrive
 
@@ -31,7 +33,7 @@
 	SIGNAL_HANDLER
 	for(var/atom/movable/loud as anything in soapboxers)
 		UnregisterSignal(loud, COMSIG_MOB_SAY)
-		soapboxers = list()
+	soapboxers.Cut()
 
 ///Gives a mob a unique say span
 /datum/component/soapbox/proc/soapbox_speech(datum/source, list/speech_args)