Bug 9188: Remove 'debug' information from patron statistics

Bug 9188: Remove 'debug' information from patron statistics

TEST PLAN
---------
run patron statistics without filtering
-- notice lots of text at top.
run patron statistics with filtering
-- notice lots of text at top.
apply patch
run it without and without filtering
-- amount of text should be small or none and be related to the filtering selected.
run koha qa test tools

Signed-off-by: Andreas Roussos <arouss1980@gmail.com>
Works as expected, i.e. only filtering information is displayed.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>