Fix bug in ace-src-noconflict with Relative url.

王权利请求将github/fork/amouhzi/patch-1合并到master

Created by: amouhzi

If we doesn't use a relative url we have this:

gon.relative_url_root=""

Else

gon.relative_url_root="/gitlab"

Gitlab::Application.config.assets.prefix contains:

/assets

合并请求报告