#409 - Fix HTTPs-only message on OAuth Clients page.

Without this change, the layout of the error message page is wrong, and the
message is different from the one used for OAuth Providers page.

This is the difference between (old):

![image](https://cloud.githubusercontent.com/assets/172235/4294324/895d8fe6-3dde-11e4-97de-84c65f4e016e.png)



and now (new):

![image](https://cloud.githubusercontent.com/assets/172235/4294310/634b05d6-3dde-11e4-8731-038d5534478f.png)

Should fix [this test](https://build.go.cd/go/tab/build/detail/regression-rails-4/64/twist/1/firefox-5#tab-twist) too.