Merge branch 'fix-remove-button-alignment' into 'master'

In SSH key detailed view, align the "Remove" button with the right container

Also fixes a bootlint warning.

Before:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/d6d8765ed9dceb6a31a6b4475b2166e1/image.png)

After:

![image](https://gitlab.com/stanhu/gitlab-ce/uploads/8252211125ace212335aa6bf2ba78549/image.png)


See merge request !1555