bachinger 426bc94090 Don't set negative values to setWhen()
When the 'when' timer of the notification is disabled
`DefaultMediaNotificationProvider` may set `C.TIME_UNSET`
as the time. Users reported problems on some devices with
this and the docs ask for an event time that probably
shouldn't be a negative number.

This change sets `0L` instead of `C.TIME_UNSET` when the
timer is disabled.

Issue: androidx/media#903

#minor-release

PiperOrigin-RevId: 594451074
2023-12-29 06:56:02 -08:00
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