Fix for remove button's ripple cut on the right when nodrop is true
Fix for remove button's ripple cut on the right when nodrop is true

Issue: when nodrop is true (on touch devices), the file remove
button's ripple effect gets cut on the right. This is caused by
the default `overflow: hidden` style on the hosting element of
<vaadin-upload>.

The `overflow: hidden` was introduced to limit the upload's drag
ripple effect. So when nodrop is true, it's not necessary.

This change removes `overflow: hidden` style when nodrop is true,
so it doesn't cut the right edge of the file remove button.

When nodrop is false (as by default), the upload gets
`overflow: hidden` together with padding, so the cutting of the
file remove button doesn't occur.

vaadin/vaadin-upload,vaadin/vaadin-upload