[editor] Remove page switch event

Use selected page index for similar functionality.

projects/editor/src/app/components/unit-view/page-view/canvas/page-canvas.component.ts

@@ -49,7 +49,7 @@ export class PageCanvasComponent implements OnInit, OnDestroy {
     this.elementUpdatedSubscription = this.unitService.elementUpdated.subscribe(() => {
       this.updateSectionElementStyles();
     });
-    this.pageSwitchSubscription = this.unitService.pageSwitch.subscribe(
+    this.pageSwitchSubscription = this.unitService.selectedPageIndex.subscribe(
       () => {
         this.clearSelection();
       }

projects/editor/src/app/unit.service.ts

@@ -21,7 +21,6 @@ export class UnitService {
   private _selectedPageSectionIndex: BehaviorSubject<number>;
 
   private _selectedElements: BehaviorSubject<UnitUIElement[]>;
-  pageSwitch = new Subject();
   elementUpdated = new Subject();
 
   constructor(private messageService: MessageService, private idService: IdService) {
@@ -152,11 +151,6 @@ export class UnitService {
     this._pages[this._selectedPageIndex.value].next(this._unit.value.pages[this._selectedPageIndex.value]);
   }
 
-  switchPage(selectedIndex: number): void {
-    this.clearSelectedElements();
-    this.pageSwitch.next(selectedIndex);
-  }
-
   clearSelectedElements(): void {
     this._selectedElements.next([]);
   }