Remove highlight when clicking external studio link (#925)

The "Record video" link kept being highlighted after it was clicked,
meaning more than one nav item was highlighted at once (since the active
route always is). This fixes the issue.

frontend/src/ui/index.tsx

@@ -91,7 +91,7 @@ export const linkWithIconStyle = (isDark: boolean, iconPos: "left" | "right", ac
             }),
         },
 
-        "&:hover, &:focus": hoverActiveStyle,
+        "&:hover, &:focus-visible": hoverActiveStyle,
         ...active && {
             color: COLORS.primary2,
             "&": hoverActiveStyle,