Bug 4402: Date filter on parcels.tt required db date format

Bug 4402: Date filter on parcels.tt required db date format

The date filters on the parcel page would only work with
dates formatted YYYY-MM-DD.

To test:
- Select a vendor, that already has a few invoices
- "Receive shipment" - you are on the parcels page
- Use the From and To filters on the left, notice there
  is now a date picker on those fields
- Verify the search works correctly for different date
  formats

Signed-off-by: Nicole <nicole@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>