fix issue with polyfill order in safari and firefox

src/polyfills.ts

@@ -55,7 +55,6 @@
 /***************************************************************************************************
  * Zone JS is required by default for Angular itself.
  */
-import 'zone.js/dist/zone';  // Included with Angular CLI.
 
 /***************************************************************************************************
  * APPLICATION IMPORTS
@@ -64,4 +63,6 @@ import 'zone.js/dist/zone';  // Included with Angular CLI.
 import 'core-js/es';
 import 'core-js/features/reflect';
 
+import 'zone.js/dist/zone';  // Included with Angular CLI.
+
 import 'reflect-metadata';