Improve kendo.isScrollable method to catch overflow-x and overflow-y cases

[zdravkov]

Improve kendo.isScrollable method to catch overflow-x and overflow-y cases

Reproduction of the problem

https://dojo.telerik.com/oSEJa

1. Open the DropDownList
2. Move the mouse over the colored area and scroll with the mouse wheel

Current behavior

-the popup does not close

Expected/desired behavior

-the popup should close

Workaround

Add the k-auto-scrollable class to the element that contains the problematic overflow styles.
Modified dojo, containing this workaround:
https://dojo.telerik.com/AwOgoNeD/2

Environment

• Kendo UI version: 2017.3.913
• Browser: [all ]

[nelito987]

Reported in ticket: #1481106