Fix syntax of git init command

lib/gitlab_shell.rb

@@ -131,7 +131,7 @@ class GitlabShell
     full_repo_path = File.join(repos_path, path)
 
     unless File.exists?(File.join(full_repo_path, 'annex'))
-      cmd = %W(git --git-dir=#{full_repo_path} annex init 'GitLab'")
+      cmd = %W(git --git-dir=#{full_repo_path} annex init "GitLab")
       system(*cmd, err: '/dev/null', out: '/dev/null')
       $logger.info "Enable git-annex for repository: #{path}."
     end