refactor(style): fix regex literal and spacing to satisfy rubocop

- switch regex to %r{[^/]+} per Style/RegexpLiteral
- remove extra spacing before `do` per Layout/ExtraSpacing

Author: coskun-kilinc

app/api/scorm_api.rb

@@ -54,7 +54,7 @@ def stream_file_from_zip(zip_path, file_path)
   end
 
   # NOTE: allow '.' in username; without this Rails/Grape treats '.' as format.
-  get '/scorm/:task_def_id/:username/:auth_token/*file_path', requirements: { username: /[^\/]+/ }  do
+  get '/scorm/:task_def_id/:username/:auth_token/*file_path', requirements: { username: %r{[^/]+} } do
     task_def = TaskDefinition.find(params[:task_def_id])
 
     unless authorise? current_user, task_def.unit, :get_unit