fix broken ical link

docs/changelog/7.x.x.txt

@@ -5,6 +5,7 @@
  - fix: Image uploads fail when not using preload.perl
  - fix: Workflow activities don't pick up new default values
  - safely allow sorting by more fields in collaboration systems
+ - fix: iCal link on calendar doesn't work
 
 7.4.10
  - fix: Graphs aren't sized properly using GraphicsMagick

lib/WebGUI/Asset/Wobject/Calendar.pm

@@ -975,7 +975,7 @@ sub view {
     $var->{"urlSearch"}     = $self->getSearchUrl;
     $var->{"urlPrint"}      = $self->getUrl("type=".$params->{type}.";start=".$params->{start}.";print=1");
     $var->{"urlIcal"}	    = $self->getUrl(
-                                    sprintf "func=ical;type=%s;start=%d",
+                                    sprintf "func=ical;type=%s;start=%s",
                                         $params->{type},
                                         $params->{start},
                               );