Bug 26712: Set focus for cursor to basket name input box on basketheader.pl

Bug 26712: Set focus for cursor to basket name input box on basketheader.pl

This patch adds the "focus" class to the basket name field in the form
for creating a new basket in acquisitions.

To test, apply the patch and go to Acquisitions -> Vendor -> New basket.

 - Upon page load the cursor should be focused on the basket name field.
 - The same should be true if you edit an existing basket.

Signed-off-by: Barbara Johnson <barbara.johnson@bedfordtx.gov>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>