fix(angular): zoom container custom class

Author: vltansky

src/angular/src/swiper.component.html

@@ -46,7 +46,7 @@
     [style]="style"
     [ngSwitch]="slide.zoom"
   >
-    <div *ngSwitchCase="true" class="swiper-zoom-container">
+    <div *ngSwitchCase="true" [ngClass]="zoomContainerClass">
       <ng-template
         [ngTemplateOutlet]="slide.template"
         [ngTemplateOutletContext]="{

src/angular/src/swiper.component.ts

@@ -409,6 +409,10 @@ export class SwiperComponent implements OnInit {
     return of(this.slides);
   }
 
+  get zoomContainerClass() {
+    return typeof this.zoom !== 'boolean' ? this.zoom.containerClass : 'swiper-zoom-container';
+  }
+
   @HostBinding('class') containerClasses = 'swiper-container';
   constructor(
     private zone: NgZone,