Use a path instead of URL for badge API endpoints

This makes this work for setups where the gitlab.yml host
is different from the one being used to access the application

app/controllers/groups_controller.rb

@@ -97,7 +97,7 @@ class GroupsController < Groups::ApplicationController
   end
 
   def edit
-    @badge_api_endpoint = expose_url(api_v4_groups_badges_path(id: @group.id))
+    @badge_api_endpoint = expose_path(api_v4_groups_badges_path(id: @group.id))
   end
 
   def projects

app/controllers/projects_controller.rb

@@ -50,7 +50,7 @@ class ProjectsController < Projects::ApplicationController
   # rubocop: enable CodeReuse/ActiveRecord
 
   def edit
-    @badge_api_endpoint = expose_url(api_v4_projects_badges_path(id: @project.id))
+    @badge_api_endpoint = expose_path(api_v4_projects_badges_path(id: @project.id))
     render_edit
   end