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/mob/mob.dm

@@ -1286,6 +1286,13 @@ mob/proc/yank_out_object()
 
 	return
 
+
+/mob/proc/is_clumsy()
+	if(CLUMSY in mutations)
+		return TRUE
+
+	return FALSE
+
 //Helper proc for figuring out if the active hand (or given hand) is usable.
 /mob/proc/can_use_hand()
 	return 1