add sonar_url for details

app/helpers/projects_helper.rb

@@ -54,7 +54,6 @@ module ProjectsHelper
     tmp_json = tmp_json.merge({
       identifier: render_identifier(project),
       name: project.name,
-      sonar_url: project.sonar_url,
       platform: project.platform,
       id: project.id,
       repo_id: repo.id,

app/views/repositories/detail.json.jbuilder

@@ -1,6 +1,7 @@
 json.content @project.content
 json.website @project.website
 json.lesson_url @project.lesson_url
+json.sonar_url @project.sonar_url
 json.identifier render_identifier(@project)
 json.invite_code @project.invite_code
 json.name @project.name