Fix scss hljs theme

What does this MR do and why?

Fixes syntax highlighting when viewing scss files with the Monokai or Solarized Dark themes.

Screenshots or screen recordings

before	after
Monokai	Monokai
Solarized Dark	Solarized Dark

How to set up and validate locally

Change theme to Monokai or Solarized Dark and view a SCSS file

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.