Invalid checkbox is not showing Checked / Unchecked state

[jpaulomotta]

Describe the bug
When a validation fails on a check box field, it's impossible to know if it's checked or unchecked later. Both states are using the same light red background.

To Reproduce
Steps to reproduce the behavior:

1. Create a model with a checkbox field
2. Fails the validation there for some reason
3. Submit an invalid form
4. Click on checkbox when it's red. It doesn't change its appearance.

Expected behavior
The check box would change when it's checked / unchecked

Screenshots

Desktop (please complete the following information):

• OS: Mac
• Browser: Chrome

Gemfile
Place here your gemfile.lock of your project

arctic_admin (3.3.0)
      activeadmin (>= 1.1.0, < 3.0)
      font-awesome-sass (~> 5.0)
      jquery-rails

[cprodhomme]

Sorry, I don't have time. if you want, you can do a pull request and I will review it ;)