Fix problem when database id is not increment as expected

Although go-gitea#17124 fixed the same issue for the feed, some other parts
with the same issue were found.

models/admin.go

@@ -107,7 +107,7 @@ func Notices(page, pageSize int) ([]*Notice, error) {
 	notices := make([]*Notice, 0, pageSize)
 	return notices, db.GetEngine(db.DefaultContext).
 		Limit(pageSize, (page-1)*pageSize).
-		Desc("id").
+		Desc("created_unix").
 		Find(&notices)
 }
 

models/issue.go

@@ -843,7 +843,7 @@ func (issue *Issue) GetLastEventLabel() string {
 func (issue *Issue) GetLastComment() (*Comment, error) {
 	var c Comment
 	exist, err := db.GetEngine(db.DefaultContext).Where("type = ?", CommentTypeComment).
-		And("issue_id = ?", issue.ID).Desc("id").Get(&c)
+		And("issue_id = ?", issue.ID).Desc("created_unix").Get(&c)
 	if err != nil {
 		return nil, err
 	}

models/token.go

@@ -161,7 +161,7 @@ func ListAccessTokens(opts ListAccessTokensOptions) ([]*AccessToken, error) {
 		sess = sess.Where("name=?", opts.Name)
 	}
 
-	sess = sess.Desc("id")
+	sess = sess.Desc("created_unix")
 
 	if opts.Page != 0 {
 		sess = db.SetSessionPagination(sess, &opts)