Fix overpass-mono mixin call

Remove $styles parameter - overpass-mono mixin doesn't support it and only generates normal styles.

Author: rubenhensen

src/lib/global.scss

@@ -7,7 +7,6 @@
 );
 
 @include overpass-mono.print-overpass-mono-font-face(
-    $styles: (normal),
     $path_to_dist: '$lib/assets/fonts/overpass-mono-webfont/'
 );