FIX: Posts with Staff Colors were excluded from the group activity

Now they are included, with the correct color applied.

spec/requests/groups_controller_spec.rb

@@ -461,6 +461,15 @@ describe GroupsController do
       expect(response.status).to eq(200)
       expect(response.parsed_body.first["id"]).to eq(post.id)
     end
+
+    it "returns moderator actions" do
+      sign_in(user)
+      post = Fabricate(:post, user: user, post_type: Post.types[:moderator_action])
+      get "/groups/#{group.name}/posts.json"
+
+      expect(response.status).to eq(200)
+      expect(response.parsed_body.first["id"]).to eq(post.id)
+    end
   end
 
   describe "#members" do