Tenacious element no longer prints a wear off message when added outside of soft crit and properly removes its effects when detached (#87901)

## About The Pull Request

Wear off message is only printed if the user actually had the effect
active before, and speed modifier is removed alongside the element.

## Changelog
🆑
fix: Fixed tenacity effect printing its messages when it shouldn't be,
and not removing its' effects when it should've.
/🆑

code/datums/elements/tenacious.dm

@@ -18,6 +18,9 @@
 /datum/element/tenacious/Detach(datum/target)
 	UnregisterSignal(target, COMSIG_MOB_STATCHANGE)
 	REMOVE_TRAIT(target, TRAIT_TENACIOUS, ELEMENT_TRAIT(type))
+	var/mob/living/carbon/human/valid_target = target
+	if(valid_target.remove_movespeed_modifier(/datum/movespeed_modifier/tenacious))
+		valid_target.balloon_alert(valid_target, "your tenacity wears off")
 	return ..()
 
 ///signal called by the stat of the target changing
@@ -27,6 +30,5 @@
 	if(new_stat == SOFT_CRIT)
 		target.balloon_alert(target, "your tenacity kicks in")
 		target.add_movespeed_modifier(/datum/movespeed_modifier/tenacious)
-	else
+	else if(target.remove_movespeed_modifier(/datum/movespeed_modifier/tenacious))
 		target.balloon_alert(target, "your tenacity wears off")
-		target.remove_movespeed_modifier(/datum/movespeed_modifier/tenacious)