Don't manually force --font-family in desktop.scss

The theme should obey the font style configured in the Discourse instance's settings and not override it.

Author: geckolinux

desktop/desktop.scss

@@ -1,7 +1,3 @@
-:root {
-  --font-family: "Helvetica Neue", Helvetica, Arial, Utkal, sans-serif;
-}
-
 .topic-list {
   tbody {
     border: none;