Remove 2FA status on enable page

The 2FA status on the enabling page is useless, since it always is `disabled`. A user is enabling 2FA, so he already knows that it is disabled.

### Before

![Screenshot_2016-03-29_12.41.27](/uploads/4800a13a82f176077a11ecaf13ed0cb1/Screenshot_2016-03-29_12.41.27.png)

### After
![Screenshot_2016-03-29_12.40.55](/uploads/a77e8acd7cf99190bbd6bd340542ad10/Screenshot_2016-03-29_12.40.55.png)

See merge request !3436