Increase color contrast

Privacy descriptions were very difficult to reason. This is the minimal level of color contrast to be WCAG AA compliant.

app/assets/stylesheets/components.scss

@@ -1703,7 +1703,7 @@ button.active i.fa-retweet {
 
 .privacy-dropdown__option__content {
   flex: 1 1 auto;
-  color: $color3;
+  color: #536f96;
 
   strong {
     font-weight: 500;