Use the gitlab-shell path from the config in Gitlab:check
Created by: jvanbaarsen
This fixes an issue in the self check, if you have Gitlab-shell in a subdirectory, the check would fail, because it would only check for~/#{gitlab_shell_user_home}/gitlab-shell
.
But when you have it in an subdirectory it had to check like:
~/#{gitlab_shell_user_home}/#{sub_dir}/gitlab-shell