Changes how clumsy checks are handled (#6299)

This pr adds the is_clumsy check, that checks if the mob has the mutation or if they are drunk enough. This fixes a bug where mobs would still have the clumsy mutation due to drinking.

code/modules/reagents/reagent_containers/inhaler.dm

@@ -34,7 +34,7 @@
 		to_chat(user,"<span class='warning'>\The [src] is empty.</span>")
 		return
 
-	if ( ((CLUMSY in user.mutations) || (DUMB in user.mutations)) && prob(10))
+	if ( ((user.is_clumsy()) || (DUMB in user.mutations)) && prob(10))
 		to_chat(user,"<span class='danger'>Your hand slips from clumsiness!</span>")
 		eyestab(H,user)
 		if(H.reagents)