kendoDragHandle does not specify a concrete drag handle when nested

[mbechev]

Description

If the kendoDragHandle directive is being applied to a nested element it no longer specifies the drag handle correctly.

Steps To Reproduce

Notice that the whole container is a drag handler:
https://stackblitz.com/edit/angular-vnhjqm-dxtxkv

Actual Behavior

In this case, the button should be the only drag handle, but since it is wrappend in <div> the whole container is draggable.

<div kendoDragTarget *ngIf="currentBox === dropTarget" class="my-drag">
    <div>
        <button
            kendoButton
            kendoDragHandle
            [svgIcon]="moveIcon"
            fillMode="flat"
         ></button>
       </div>
       Drag
</div>

Expected Behavior

Only the button should be a drag handle.