[DSC-1864] Fix lint warnings

Author: atarix83

src/app/shared/context-menu/context-menu.component.ts

@@ -1,4 +1,4 @@
-import { ChangeDetectorRef, Component, Inject, Injector, Input, OnInit } from '@angular/core';
+import { AfterViewChecked, ChangeDetectorRef, Component, Inject, Injector, Input, OnInit } from '@angular/core';
 import { DOCUMENT } from '@angular/common';
 
 import { from, Observable } from 'rxjs';
@@ -24,7 +24,7 @@ import { GenericConstructor } from '../../core/shared/generic-constructor';
   styleUrls: ['./context-menu.component.scss'],
   templateUrl: './context-menu.component.html'
 })
-export class ContextMenuComponent implements OnInit {
+export class ContextMenuComponent implements OnInit, AfterViewChecked {
 
   /**
    * The related item
@@ -124,10 +124,6 @@ export class ContextMenuComponent implements OnInit {
     );
   }
 
-  isItem(): boolean {
-    return this.contextMenuObjectType === DSpaceObjectType.ITEM;
-  }
-
   ngAfterViewChecked() {
     // To check that Context-menu contains options or not
     if (this._document.getElementById('itemOptionsDropdownMenu')) {