Solarized Light: Fix color for linked-to comment

Happened because I changed the "warning" color for this theme to orange
instead of yellow, which conflicts with the stripe for new comments.

tildes/scss/themes/_solarized.scss

@@ -77,6 +77,7 @@ $solarized-light: (
   "foreground-highlight": $fg-darkest,
   "foreground-primary": $fg-dark,
   "foreground-secondary": $fg-lightest,
+  "stripe-target": $yellow,
   "warning": $orange,
 );