UX: improve handling of users in queued-posts

- Display an icon on already blocked users
- Automatically unblock users that you approve

spec/controllers/posts_controller_spec.rb

@@ -492,8 +492,17 @@ describe PostsController do
 
         expect(parsed["action"]).to eq("enqueued")
 
+        user.reload
         expect(user.blocked).to eq(true)
 
+        qp = QueuedPost.first
+
+        mod = Fabricate(:moderator)
+        qp.approve!(mod)
+
+        user.reload
+        expect(user.blocked).to eq(false)
+
       end
 
       it 'creates the post' do