Add rubocop spacing rules

We were following these rules in most places; we just didn't define them
anywhere.

app/controllers/admin/comments_controller.rb

@@ -7,7 +7,7 @@ class Admin::CommentsController < Admin::BaseController
 
     respond_to do |format|
       format.html
-      format.csv {send_data to_csv(Comment.sort_by_newest, Comment),
+      format.csv { send_data to_csv(Comment.sort_by_newest, Comment),
                             type: "text/csv",
                             disposition: "attachment",
                             filename: "comments.csv" }