Merge branch 'mk/remove-extra-space' into 'master'

Remove extra space in API 403 Forbidden error message

See merge request gitlab-org/gitlab!50016

changelogs/unreleased/mk-remove-extra-space.yml

+---
+title: Remove extra space in API 403 Forbidden error message
+merge_request: 50016
+author:
+type: changed

lib/api/helpers.rb

@@ -372,7 +372,7 @@ module API
 
     def forbidden!(reason = nil)
       message = ['403 Forbidden']
-      message << " - #{reason}" if reason
+      message << "- #{reason}" if reason
       render_api_error!(message.join(' '), 403)
     end