Fixes COMSIG_LIVING_EARLY_UNARMED_ATTACK arguments (#80783)

## About The Pull Request

Fixes #80566 

Fixes the wrong arguments being passed to
`COMSIG_LIVING_EARLY_UNARMED_ATTACK`.
It now properly receives the proximity flag. 

Changes clicking with handcuffs to no longer always assume no proximity.

Replaces some checks for hands blocked to some checks for
`can_unarmed_attack` (which, currently, JUST checks for hands blocked,
but this is good for future reasons, just in case)

## Changelog

🆑 Melbert
fix: Strong arm implant users can shove more correctly. 
/🆑

code/modules/mob/living/basic/bots/cleanbot/cleanbot.dm

@@ -321,15 +321,18 @@
 	INVOKE_ASYNC(weapon, TYPE_PROC_REF(/obj/item, attack), stabbed_carbon, src)
 	stabbed_carbon.Knockdown(2 SECONDS)
 
-/mob/living/basic/bot/cleanbot/proc/pre_attack(mob/living/source, atom/target)
+/mob/living/basic/bot/cleanbot/proc/pre_attack(mob/living/source, atom/target, proximity, modifiers)
 	SIGNAL_HANDLER
 
+	if(!proximity || !can_unarmed_attack())
+		return NONE
+
 	if(is_type_in_typecache(target, huntable_pests) && !isnull(our_mop))
 		INVOKE_ASYNC(our_mop, TYPE_PROC_REF(/obj/item, melee_attack_chain), src, target)
 		return COMPONENT_CANCEL_ATTACK_CHAIN
 
 	if(!iscarbon(target) && !is_type_in_typecache(target, huntable_trash))
-		return
+		return NONE
 
 	visible_message(span_danger("[src] sprays hydrofluoric acid at [target]!"))
 	playsound(src, 'sound/effects/spray2.ogg', 50, TRUE, -6)