Fix NumericDatePicker bug

[ndegwamartin]

A Bug in the NumericDatePicker class which sometimes causes crash when one selects a date out of the range of allowed dates (min and max dates)

[qiarie]

How to Replicate

1. Run the native-form sample app
2. Open BIRTH REGISTER form
3. Scroll to Child's DOB and tap to select a date
4. On the date picker dialog, select 30 or 31 for the day of the month selector
5. Try to scroll to 2 (February) on the month selector

Expected Outcome

The app hangs on attempting to select February while the day of the month selected is greater than the possible max value. This is caused by an infinite loop when trying to reset the day part due to the malformed date.

Solution

Reset the day of the month selector max value to 28 (29 if the selected year is a leap year) when the value selected in the month selector is 2 (February)