gitweb: Add missing show '...' links change.

Part of the patch for "gitweb: Show '...' links in "summary" view only
if there are more items" (313ce8cee6) is
missing.  Add it back in.

Signed-off-by: Robert Fitzsimons <robfitz@273k.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

gitweb/gitweb.perl

@@ -2983,6 +2983,7 @@ sub git_summary {
 	if (@forklist) {
 		git_print_header_div('forks');
 		git_project_list_body(\@forklist, undef, 0, 15,
+		                      $#forklist <= 15 ? undef :
 		                      $cgi->a({-href => href(action=>"forks")}, "..."),
 				      'noheader');
 	}