fix changeling middle click stings becoming stuck (#25621)

code/modules/antagonists/changeling/datum_changeling.dm

@@ -81,9 +81,9 @@ RESTRICT_TYPE(/datum/antagonist/changeling)
 
 /datum/antagonist/changeling/Destroy()
 	SSticker.mode.changelings -= owner
-	chosen_sting = null
 	QDEL_LIST_CONTENTS(acquired_powers)
 	STOP_PROCESSING(SSobj, src)
+	chosen_sting = null
 	return ..()
 
 /datum/antagonist/changeling/greet()

code/modules/antagonists/changeling/powers/tiny_prick.dm

@@ -12,11 +12,9 @@
 	click_override = new(CALLBACK(src, PROC_REF(try_to_sting)))
 
 /datum/action/changeling/sting/Destroy(force, ...)
-	if(cling.owner.current && cling.owner.current.middleClickOverride == click_override) // this is a very scuffed way of doing this honestly
-		cling.owner.current.middleClickOverride = null
 	QDEL_NULL(click_override)
 	if(cling.chosen_sting == src)
-		cling.chosen_sting = null
+		unset_sting()
 	return ..()
 
 /datum/action/changeling/sting/Trigger(left_click)
@@ -25,6 +23,12 @@
 	else
 		unset_sting()
 
+/datum/action/changeling/sting/Remove(mob/remove_from)
+	. = ..()
+	// Check that cling exists because in certain scenarios, it may have been deleted in Destroy() first.
+	if(cling?.chosen_sting == src)
+		unset_sting()
+
 /datum/action/changeling/sting/proc/set_sting()
 	var/mob/living/user = owner
 	to_chat(user, "<span class='warning'>We prepare our sting, use alt+click or middle mouse button on a target to sting them.</span>")