Disable the User Fills Out Comment system spec (#13103)

This one file seems to be associated with segfaults we're observing in
TravisCI.

To narrow down the source of the issue, disable this set of tests. (If
segfaults continue, this was not the cause and should be re-enabled).

Co-authored-by: djuber <djuber@forem.beta-reduction.com>

spec/system/comments/user_fills_out_comment_spec.rb

@@ -1,6 +1,6 @@
 require "rails_helper"
 
-RSpec.describe "Creating Comment", type: :system, js: true do
+RSpec.xdescribe "Creating Comment", type: :system, js: true do
   include_context "with runkit_tag"
 
   let(:user) { create(:user) }