完全にバグってたorz

Before
````
[30] pry(main)> Word.joins(:clip).where('status != 8').order('updated_at DESC')
  Word Load (0.3ms)  SELECT "words".* FROM "words" INNER JOIN "clips" ON "clips"."word_id" = "words"."id"
 WHERE (status != 8) 
ORDER BY updated_at DESC
=> []
````
After
````
[31] pry(main)> Word.clipped.where.not(clips: {status: 8}).merge(Clip.display.done)
  Word Load (0.3ms)  SELECT "words".* FROM "words" INNER JOIN "clips" ON "clips"."word_id" = "words"."id"
 WHERE "clips"."status" = 8 AND ("clips"."status" != 8) 
ORDER BY clips.updated_at DESC
````