[Glitch] Change contrast of status links that are not mentions nor hashtags

Port 6701b9329d to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/components/status_content.js

@@ -51,6 +51,7 @@ export default class StatusContent extends React.PureComponent {
       } else {
         link.addEventListener('click', this.onLinkClick.bind(this), false);
         link.setAttribute('title', link.href);
+        link.classList.add('unhandled-link');
       }
 
       link.setAttribute('target', '_blank');

app/javascript/flavours/glitch/styles/components/status.scss

@@ -133,6 +133,10 @@
     }
   }
 
+  a.unhandled-link {
+    color: lighten($ui-highlight-color, 8%);
+  }
+
   .status__content__spoiler-link {
     background: lighten($ui-base-color, 30%);