fix(module:carousel): support dynamic change of nz-carousel-content

[vthinkxie]

Closes #56

[coveralls]

Coverage remained the same at 52.163% when pulling dc30074 on vthinkxie:master into ba8af56 on NG-ZORRO:master.

[giscafer]

well done!

[giscafer]

One line of code is missing here.
this._renderer.removeStyle(this.slickList.nativeElement, 'height');

if not，in vertical mode, the slickList's height will be setting to 0 .

[vthinkxie]

slickList's height is defined when ngAfterViewInit trigger, this height won't change when vertical mode. If remove its style here, the height will be multiple here.

[giscafer]

@vthinkxie if not, the height is 0, nz-demo-carousel-vertical demo can't display normally

you should test it by modify the code:

NzDemoCarouselVerticalComponent

export class NzDemoCarouselVerticalComponent implements OnInit {
 array = [  ]; // try dynamic change the array
  
    constructor() {
    }
  
    ngOnInit() {
  setTimeout(()=>{
      this.array = [ 1, 2, 3, 4 ];
    },500)
    }
  }

[vthinkxie]

you are right. I will update this code.

[coveralls]

Coverage remained the same at 52.163% when pulling d69bed6 on vthinkxie:master into 0c6bcbb on NG-ZORRO:master.