[EuiDatePicker] Support inline + showTimeSelectOnly on mobile

[smhutch]

display: none is applied on mobile to the time picker within DatePicker.

Demo

Sandbox

Design on 768px wide screens

Design on 767px wide screens

Workaround

Currently I have a CSS override to work around this:

#my-component .react-datepicker__time-container {
  display: block !important;
}

[cchaos]

I think we should just remove the media query on this one. Since the inputs aren't real inputs there's no way to add in a time selection on mobile. We can rethink how we want to handle mobile layout when we address the rewrite of this component. But for now lets just fix the problem.