Purchase Add - Filter the pen for the selected cattle quality.

[diego-torres]

When adding a purchase, filter the pen list based on the cattle quality selected.

• Don't forget to have all available pens as available for selection.
• Don't include any occupied pen with a different cattle quality.

[alfredoPacheco]

Done. commit 2542fa0a19b1b622c15655ca52a955c973ecb166