show-whitespace can't be disabled for gists #2300

<!-- Thanks for reporting a bug! ⛰ 1. Make sure the bug is caused by Refined GitHub. Try disabling the extension first. 2. Include a full URL where the bug appears. 3. Include a screenshot/gif Issues without a URL/screenshot will be closed -->

I have the show-whitespace feature disabled, but whitespace is still shown in gists.

Example: https://gist.github.com/trueadm/17beb64288e30192f3aa29cad0218067

I have verified that disabling the extension stops whitespace being shown.