Optimize away always-true hold count clause

When rendering results in the tpac we request hold counts for each record.
Most of the time (that is, whenever org unit hiding is /not/ in use) we
filter, essentially, on "where pickup_lib is in the org tree".  This is
both useless and slow, so this commit will recognize that and optimize the
test away.

[LFW: fixed typo]

Signed-off-by: Mike Rylander <mrylander@gmail.com>
Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>