[BUG] nz-checkbox directive will make lost host class

[cipchk]

I'm submitting a...

[x] Bug report  

Current behavior

the html code:

<label nz-checkbox class="d-block">
    <span>Checkbox</span>
</label>

fact dom rendering result:

<label class="ant-checkbox-wrapper" nz-checkbox="">
    <span class="ant-checkbox" ng-reflect-ng-class="[object Object]">
      <span class="ant-checkbox-inner" ng-reflect-ng-class="ant-checkbox-inner"></span>
      <input type="checkbox" class="ant-checkbox-input ng-untouched ng-pristine ng-valid" ng-reflect-ng-class="ant-checkbox-input" ng-reflect-model="false">
    </span>
    
                                    <span>Checkbox</span>
                                
  </label>

my .d-block class is gone.

[vthinkxie]

confirm, fix next version.

[lock]

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