Clean properly viewLayer from the component. Closes #6001

Fix the bug where the layer manager breaks when alternating between pages.

src/navigator/view/ItemView.ts

@@ -159,7 +159,6 @@ export default class ItemView extends View {
     ].forEach(item => this.listenTo(model, item[0], item[1]));
     this.$el.data('model', model);
     this.$el.data('collection', components);
-    // @ts-ignore
     model.viewLayer = this;
     onInit.bind(this)({
       component: model,
@@ -396,6 +395,7 @@ export default class ItemView extends View {
 
   remove(...args: []) {
     View.prototype.remove.apply(this, args);
+    delete this.model.viewLayer;
     this.__clearItems();
     return this;
   }

src/pages/index.ts

@@ -101,7 +101,7 @@ export default class PageManager extends ItemManagerModule<PageManagerConfig, Pa
     const { em, events } = this;
     const lm = em.Layers;
     const mainComp = page.getMainComponent();
-    lm && mainComp && lm.setRoot(mainComp as any);
+    lm && mainComp && lm.setRoot(mainComp);
     em.trigger(events.select, page, m.previous('selected'));
     this.__onChange(chnSel, page, opts);
   }