DatePicker - Validation does not change border color

[paulosdfigueiredo]

Describe the bug
New component DatePicker does not update border color based on the current validation status.
"is-invalid" and "is-valid" classes are added to the wrong input element.

I'm using bootstrap.

To Reproduce
Steps to reproduce the behavior:

1. Go to Demo
2. Go to Validations Page
3. Replace DateEdit by DatePicker
4. Force validation

Expected behavior
Expected the border to be red, because Date is required as we can see by the feedback message.

The problem is that is-invalid is added to the hidden input instead of the correct one.