Fix /datum/component/listen_prayers not removing action button from UI when component deleted from mob (#96703)

## About The Pull Request
Small bugfix and slight refactor for the
`/datum/component/listen_prayers` component to make it more robust.

When this component was removed from a mob, it would not properly clean
up the listen to prayer button in the UI. It also has had its arguments
cleaned up so that you can attach it with no arguments as a valid
method.

## Why It's Good For The Game
Better code.

## Changelog
🆑
fix: Fix `/datum/component/listen_prayers` not removing action button
from UI when component deleted from mob
/🆑

code/datums/components/listen_prayers.dm

@@ -10,14 +10,18 @@
 	///The action that the owner can use to ignore the prayers
 	var/datum/action/innate/listen_prayers/toggle
 	///The description we give to the instance of the listen_prayers toggle.
-	var/toggle_desc
+	var/toggle_desc = "Allows you to listen to prayers"
 
 /datum/component/listen_prayers/Initialize(datum/callback/pre_prayer_callback, deity_name, toggle_desc)
-	if (!istype(parent, /datum/mind))
+	if(!istype(parent, /datum/mind))
 		return COMPONENT_INCOMPATIBLE
-	src.pre_prayer_callback = pre_prayer_callback
-	src.deity_name = deity_name
-	src.toggle_desc = toggle_desc
+
+	if(pre_prayer_callback)
+		src.pre_prayer_callback = pre_prayer_callback
+	if(deity_name)
+		src.deity_name = deity_name
+	if(toggle_desc)
+		src.toggle_desc = toggle_desc
 
 /datum/component/listen_prayers/Destroy()
 	pre_prayer_callback = null
@@ -26,8 +30,7 @@
 /datum/component/listen_prayers/RegisterWithParent()
 	RegisterSignal(SSdcs, COMSIG_GLOB_SEND_PRAYER, PROC_REF(on_sent_prayer))
 	var/datum/mind/mind = parent
-
-	var/datum/action/innate/listen_prayers/toggle = new(mind)
+	toggle = new(mind)
 	if(toggle_desc)
 		toggle.desc = toggle_desc
 	if(mind.current)