MAGETWO-53299: "Go Today" button is not working for dates range component

- condition refactored according to CR comment

Author: iivashchenko

lib/web/mage/calendar.js

@@ -40,7 +40,7 @@
             // local time in ms
             var ms = Date.now();
 
-            options = options || ($.calendarConfig ? $.calendarConfig : {});
+            options = options || $.calendarConfig || {};
 
             // Adjust milliseconds according to store timezone offset,
             // mind the GMT zero offset