bug 2543: follow-up patch

Add 'use C4::Reports' lines that original patch
omitted.

Note that original patch prevented these two reports
from even compiling.  Not good.

Signed-off-by: Galen Charlton <galen.charlton@liblime.com>

reports/cat_issues_top.pl

@@ -26,6 +26,7 @@ use C4::Branch; # GetBranches
 use C4::Output;
 use C4::Koha;
 use C4::Circulation;
+use C4::Reports;
 use C4::Dates qw/format_date format_date_in_iso/;
 use C4::Members;
 

reports/issues_avg_stats.pl

@@ -26,6 +26,7 @@ use C4::Branch; # GetBranches
 use C4::Output;
 use C4::Koha;
 use C4::Circulation;
+use C4::Reports;
 use C4::Dates qw/format_date format_date_in_iso/;
 use Date::Calc qw(Delta_Days);