When using is-block setting, the default checkbox is displayed

[MangelMaxime]

The is-block seems like a good thing however, we should not display the default checkbox.

Tested with:

• Firefox: 56.0 (32bits)
• Chromium: Version 60.0.3109.0 (Build de développement) (64 bits)

[Wikiki]

Fixed with ec81686

[MangelMaxime]

Awesome thank you :)