verticla mode dcc.DatePicker and dcc.DatePickerRange do not render as expected.

[shammamah-zz]

Follow-up issue for #699. vertical mode for either of these components does not match up with what it should look like according to the react-dates examples: https://airbnb.io/react-dates/?path=/story/daterangepicker-drp--vertical-with-custom-height

[chriddyp]

vs