Fix posts_like and thread_like migrations

diskuy_back/priv/repo/migrations/20210108141754_create_thread_likes.exs

@@ -11,6 +11,6 @@ defmodule Diskuy.Repo.Migrations.CreateThreadLikes do
 
     create index(:thread_likes, [:user_id])
     create index(:thread_likes, [:thread_id])
-    create unique_index(:threads, [:user_id, :thread_id], name: :user_thread_unique)
+    create unique_index(:thread_likes, [:user_id, :thread_id], name: :user_thread_unique)
   end
 end

diskuy_back/priv/repo/migrations/20210108143501_create_post_likes.exs

@@ -11,6 +11,6 @@ defmodule Diskuy.Repo.Migrations.CreatePostLikes do
 
     create index(:post_likes, [:user_id])
     create index(:post_likes, [:post_id])
-    create unique_index(:threads, [:user_id, :post_id], name: :user_post_unique)
+    create unique_index(:post_likes, [:user_id, :post_id], name: :user_post_unique)
   end
 end