Shorthand method definition syntax replaced with standard one

Author: vovayatsyuk

lib/web/mage/sticky.js

@@ -17,7 +17,7 @@ define([
             stickyClass: '_sticky'
         },
 
-        _optionToNumber(option) {
+        _optionToNumber: function (option) {
             var value = this.options[option] || 0;
             if (typeof value === 'function') {
                 value = this.options[option]();