[BUG] nz-carousel 设置 nzAutoPlay 问题

[cipchk]

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[x] Bug report  

Current behavior

当设置 [nzAutoPlay]="false" 后，开始的确不会自动切换。但如果手动切换至第二张后，又变成自动切换。

Expected behavior

当设置 [nzAutoPlay]="false" 后，至始至终都应属于手动切换。

Minimal reproduction of the problem with instructions

<nz-carousel [nzAutoPlay]="false">
    <div nz-carousel-content>
        one
    </div>
    <div nz-carousel-content>
        two
    </div>
</nz-carousel>

Environment

Angular version: 4.2.4
ng-zorro-antd version: 0.5.0-rc2

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