fix(module:collapse): no ghost zone if collapsed (#9649)

Author: Nicoss54

components/collapse/collapse-panel.component.ts

@@ -69,6 +69,7 @@ const NZ_CONFIG_MODULE_NAME: NzConfigKey = 'collapsePanel';
       [class.ant-collapse-content-active]="active()"
       animation-collapse
       [open]="active()"
+      leavedClassName="ant-collapse-content-hidden"
     >
       <div class="ant-collapse-content-box">
         <ng-content />

components/core/animation/collapse.ts

@@ -78,6 +78,9 @@ export class NzAnimationCollapseDirective {
         } else {
           element.style.height = coerceCssPixelValue(0);
           element.style.opacity = '0';
+          if (leavedClassName) {
+            element.classList.add(leavedClassName);
+          }
         }
       }