LP#2043029 - Z3950.pm log noise

LP#2043029 - Z3950.pm log noise

A debug logging line was trying to reference array entries that don't exist
when the local catalog search option is also selected.

open-ils.search [WARN:24303:Application.pm:624:169942320622879281]
open-ils.search.z3950.search_class: Use of uninitialized value in concatenation
 (.) or string at /usr/local/share/perl/5.36.0/OpenILS/Application/Search/Z3950.pm line 282.

The debug line was trying to access by a counter variable, but the values were being pushed
to the array, so would get out of sync with the counter when native evergreen search
is also selected.

To trigger perform a Z39.50 search with a Z39.50 server and local evergreen catalog
selected.

Signed-off-by: Josh Stompro <stomproj@larl.org>