[player] Unsubscribe from subject on destroy in ScrollToIndexDirective

projects/player/src/app/directives/scroll-to-index.directive.ts

 import {
-  Directive, ElementRef, Input, OnInit
+  Directive, ElementRef, Input, OnDestroy, OnInit
 } from '@angular/core';
 import { Subject } from 'rxjs';
 
 @Directive({
   selector: '[aspectScrollToIndex]'
 })
-export class ScrollToIndexDirective implements OnInit {
+export class ScrollToIndexDirective implements OnInit, OnDestroy {
   @Input() selectIndex!: Subject<number>;
   @Input() index!: number;
 
+  private ngUnsubscribe = new Subject<void>();
+
   constructor(private elementRef: ElementRef) {}
 
   ngOnInit(): void {
@@ -19,4 +21,9 @@ export class ScrollToIndexDirective implements OnInit {
       }
     });
   }
+
+  ngOnDestroy(): void {
+    this.ngUnsubscribe.next();
+    this.ngUnsubscribe.complete();
+  }
 }