Fix bug when `autoFocus` is set to `true`, and `value` is empty

[royhansen99]

Fix bug when autoFocus is set to true, and value is empty, the initial value typed into the hour input is cleared as soon as you finish typing and move to the minutes input. Will now use autoFocus when setting initial value for isOpen, if isOpenProps is undefined.

Explanation of the bug: The TimePicker input is focused as expected, but the isOpen property is not set to true. This causes the isOpen property to be set to true as soon as you land on the second input (minutes), which again leads to the hours being cleared.