Update sorting function in Readability.js

Simplify sorting function also considering case where arguments are equal

Co-Authored-By: jemrobinson <james.em.robinson@gmail.com>

Author: gijsk

Readability.js

@@ -1141,7 +1141,7 @@ Readability.prototype = {
           this._attempts.push({articleContent: articleContent, textLength: textLength});
           // No luck after removing flags, just return the longest text we found during the different loops
           this._attempts.sort(function (a, b) {
-            return (a.textLength < b.textLength) ? 1 : -1;
+            return b.textLength - a.textLength;
           });
 
           // But first check if we actually have something