Sort users and orgs on explore by recency by default (#24279)

This gives more "freshness" to the explore page. So it's not just the
same X users on the explore page by default, now it matches the same
sort as the repos on the explore page.

---------

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

routers/web/admin/orgs.go

@@ -23,6 +23,10 @@ func Organizations(ctx *context.Context) {
 	ctx.Data["Title"] = ctx.Tr("admin.organizations")
 	ctx.Data["PageIsAdminOrganizations"] = true
 
+	if ctx.FormString("sort") == "" {
+		ctx.SetFormString("sort", explore.UserSearchDefaultAdminSort)
+	}
+
 	explore.RenderUserSearch(ctx, &user_model.SearchUserOptions{
 		Actor: ctx.Doer,
 		Type:  user_model.UserTypeOrganization,

routers/web/admin/users.go

@@ -53,7 +53,8 @@ func Users(ctx *context.Context) {
 
 	sortType := ctx.FormString("sort")
 	if sortType == "" {
-		sortType = explore.UserSearchDefaultSortType
+		sortType = explore.UserSearchDefaultAdminSort
+		ctx.SetFormString("sort", sortType)
 	}
 	ctx.PageData["adminUserListSearchForm"] = map[string]interface{}{
 		"StatusFilterMap": statusFilterMap,