Sort Categories by issues count descending

Fixes #25524

plugins/MantisGraph/pages/category_graph.php

@@ -34,6 +34,7 @@
 print_summary_submenu();
 
 $t_metrics = create_category_summary( $t_filter );
+array_multisort( $t_metrics, SORT_DESC, SORT_NUMERIC);
 
 # Dynamically set width ratio between 1 and 0.25 based on number of categories
 $t_wfactor = 1 - min( max( count( $t_metrics ), 25 ) - 25, 75 ) / 100;