TPAC: Sort copies from preferred library first

TPAC: Sort copies from preferred library first

This commit makes copies from the preferred library (if any) sort first
in the displayed copy list in search results and record details, even
if the search scope would otherwise not include the preferred library's
copies at all.

Signed-off-by: Dan Scott <dan@coffeecode.net>
Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>