Auto-check "done" checkboxes in Planting quick form based on date

[mstenta]

The Planting quick form allows you to create seeding, transplanting, and harvest logs, and they can be post-dated (to record things that already happened). However, the "done" checkbox is not automatically checked, so if you record a past seeding, then the planting will not show the "current location" from it because the log is not "done".

In other places in farmOS we have a bit of JS that auto-checks the "done" box when the date is in the past. Let's do the same thing here.