Datepicker refresh interval should not be allowed to go negative

[LeeDr]

The number field shouldn't go below zero here. Image from 8.4.0

[chandlerprall]

We use the input[type=number] element here which, by itself, doesn't allow additional configuration over content. We could probably intercept the key event and prevent the default browser action if it isn't a numeral or dot (/[0-9.]/). To handle using the down arrow in the spinner, we can similarly enforce a minimum value of 0. I don't think we'd want specific logic if an application passes a negative number, as the error state handling will continue working for that scenario.

Relates in concept to #5186, as both require a pattern for allowing users to get into, see, and edit error states without the error handling logic interrupting them.

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