Bug 14279: Remove CGI::scrolling_list from issues_avg_stats.pl

Bug 14279: Remove CGI::scrolling_list from issues_avg_stats.pl

This patch removes scrolling_lists from this file

To test
1) Go to Reports > Average loan time
2) Check dropdowns Patron category, Item type, Sort1/2 and Into application
will be changed
3) Apply the patch
4) Reload and check for regression

Followed test plan. Works as expected.
Signed-off-by: Marc Veron <veron@veron.ch>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>