Bug 6154: Default sorting by title doesn't work

Bug 6154: Default sorting by title doesn't work

If you have the default sorting set to title ascending or title descending,
your search results will not automatically be sorted because the syspref uses
title_asc and title_dsc, whereas Search.pm wants title_az and title_za. The same
issue is present when the default sort is on author.

Signed-off-by: Ian Walls <ian.walls@bywatersolutions.com>
Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
(cherry picked from commit 499c694daf408571cc8370b4c20568336ba35cde)

Signed-off-by: Chris Nighswonger <chris.nighswonger@gmail.com>