migrations: set comment updated as created

models/issue_comment.go

@@ -358,7 +358,7 @@ func getCommentsByIssueIDSince(e Engine, issueID, since int64) ([]*Comment, erro
 	comments := make([]*Comment, 0, 10)
 	sess := e.Where("issue_id = ?", issueID).Asc("created_unix")
 	if since > 0 {
-		sess.And("created_unix >= ?", since)
+		sess.And("updated_unix >= ?", since)
 	}
 	return comments, sess.Find(&comments)
 }