try again to fix the @ links

Author: pfaffman

javascripts/discourse/services/links-settings.js

@@ -18,7 +18,7 @@ export default class NormalizedProfileLinks extends Service {
       return null;
     }
 
-    const normalizedBase = baseUrl.endsWith("/") ? baseUrl : baseUrl + "/";
+    const normalizedBase = baseUrl.endsWith("/") || baseUrl.endsWith("@") ? baseUrl : baseUrl + "/";
     return `${normalizedBase}${username}`;
   }