Remove duplicate import in index.scss
Remove duplicate import in index.scss

Sass treats 'conditionals' and '_conditionals' as the same file,
the one from the frontend toolkit. Remove the unnecessary second
import.

alphagov/spotlight,tijmenb/spotlight,tijmenb/spotlight,keithiopia/spotlight,keithiopia/spotlight,alphagov/spotlight,tijmenb/spotlight,alphagov/spotlight,keithiopia/spotlight