Fix propTypes warning in TimePickerPopup test...
Fix propTypes warning in TimePickerPopup test...

Warning: Failed propType: Invalid prop `hours` of type `number` supplied to `FriggingBoo
tstrap.TimePickerPopup`, expected `string`.
Warning: Failed propType: Invalid prop `minutes` of type `number` supplied to `FriggingB
ootstrap.TimePickerPopup`, expected `string`.

frig-js/frigging-bootstrap,frig-js/frigging-bootstrap