FIX: Don't validate approved posts.

A moderator has already validated them. Otherwise we hit things like
rate limits.

app/models/queued_post.rb

@@ -51,7 +51,7 @@ class QueuedPost < ActiveRecord::Base
     QueuedPost.transaction do
       change_to!(:approved, approved_by)
 
-      creator = PostCreator.new(user, create_options)
+      creator = PostCreator.new(user, create_options.merge(skip_validations: true))
       created_post = creator.create
     end
     created_post

spec/models/queued_post_spec.rb

@@ -41,7 +41,12 @@ describe QueuedPost do
 
       # We can't approve twice
       expect(-> { qp.approve!(admin) }).to raise_error(QueuedPost::InvalidStateTransition)
+    end
 
+    it "skips validations" do
+      qp.post_options[:title] = 'too short'
+      post = qp.approve!(admin)
+      expect(post).to be_present
     end
 
     it "follows the correct workflow for rejection" do