Do not display the D&D area when the browser does not support HTML5 D&D

In the summary tab of a File document, an area is drawn to invite people to drop a file when no file was previously attached.

However, this feature is only active for browsers which support HTML5 D&D.

When using other browsers, like IE8, we should not display this zone.
We can use useHtml5DragAndDrop factory for that.