Add service request categories to ticket overview API

F4SDM42WebApi/F4SDHelperService.UserId.cs

@@ -117,7 +117,7 @@ namespace C4IT.F4SD
                     var source = !useRoleScope && IsUnassignedOverviewKey(key)
                         ? unassignedEntries ?? new List<TicketOverviewEntry>()
                         : entries;
-                    counts[key] = source.Count(entry => MatchesTicketOverviewKey(entry, key));
+                    counts[key] = CountTicketOverviewEntries(source, key);
                 }
 
                 return new TicketOverviewCountsResult { Counts = counts };