fix issues.js checkDefault and Table default bug

[rainbow401]

create table blog.article
(
    id          bigint auto_increment comment 'id'
        primary key,
    title       varchar(100)                        not null comment '标题',
    content     text                                null comment '内容',
    create_by   bigint                              not null,
    create_time timestamp default CURRENT_TIMESTAMP not null,
    update_by   bigint                              not null,
    update_time timestamp default CURRENT_TIMESTAMP not null on update CURRENT_TIMESTAMP,
    deleted     tinyint   default 0                 not null
);

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