Fix basic mobs triggering click cooldown erroneously. (#95906)

## About The Pull Request

Basic Mobs used to always trigger cooldown on clicks. This resulted in
missed attacks causing you to have a delay before you could attack
again, this makes it really punishing to play as a basic mob.

To resolve this I did a mini-refactor on basic mob's attack chain to
allow for the return values to determine whether we go on cooldown or
not. Preventing attacks that did nothing (due to not passing checks, or
simply not having any behavior) from causing cooldown.

This fixes #95605

## Why It's Good For The Game

being able to perform melee with the same rules as /human is only fair

## Changelog

🆑 DresserOnFire
fix: Fixes a bug where player-controlled basic mobs would get a cooldown
when their attacks miss
refactor: basic mob attack chain can now decided whether an attack
resulted in a cooldown or not.
/🆑

code/modules/mob/living/basic/space_fauna/morph.dm

@@ -149,29 +149,29 @@
 /// Handles the logic for attacking anything.
 /mob/living/basic/morph/early_melee_attack(atom/target, list/modifiers, ignore_cooldown)
 	. = ..()
-	if(!.)
-		return FALSE
+	if(.)
+		return
 
 	if(HAS_TRAIT(src, TRAIT_DISGUISED) && (melee_damage_disguised <= 0))
 		balloon_alert(src, "can't attack while disguised!")
-		return FALSE
+		return BASIC_MOB_END_ATTACK_CHAIN_COOLDOWN
 
 	if(isliving(target)) //Eat Corpses to regen health
 		var/mob/living/living_target = target
 		if(living_target.stat != DEAD)
-			return TRUE
+			return BASIC_MOB_CONTINUE_ATTACK_CHAIN
 
 		eat(eatable = living_target, delay = 3 SECONDS, update_health = -50)
-		return FALSE
+		return BASIC_MOB_END_ATTACK_CHAIN_COOLDOWN
 
 	if(!isitem(target)) //Eat items just to be annoying
-		return TRUE
+		return BASIC_MOB_CONTINUE_ATTACK_CHAIN
 
 	var/obj/item/item_target = target
 	if(item_target.anchored)
-		return TRUE
+		return BASIC_MOB_CONTINUE_ATTACK_CHAIN
 	eat(eatable = item_target, delay = 2 SECONDS)
-	return FALSE
+	return BASIC_MOB_END_ATTACK_CHAIN_COOLDOWN
 
 /// Eat stuff. Delicious. Return TRUE if we ate something, FALSE otherwise.
 /// Required: `eatable` is the thing (item or mob) that we are going to eat.