[Glitch] Update style of captcha confirmation page to match sign-up form (#2226)

app/javascript/flavours/glitch/styles/forms.scss

@@ -137,6 +137,10 @@ code {
     line-height: 22px;
     color: $secondary-text-color;
     margin-bottom: 30px;
+
+    a {
+      color: $highlight-text-color;
+    }
   }
 
   .rules-list {