Fix: Error in navbar, didn't do anything, but showed up in the errors.

overlord/src/app/core/nav-bar/nav-bar.component.html

@@ -1,12 +1,4 @@
 <mat-toolbar class="fixed-to-top">
-  <button
-    type="button"
-    aria-label="Toggle sidenav"
-    mat-icon-button
-    (click)="drawer.toggle()"
-    *ngIf="(isHandset | async)!.matches">
-    <mat-icon aria-label="Side nav toggle icon">menu</mat-icon>
-  </button>
   <span><a routerLink="/">HnG / TGB</a></span>
   <mat-menu #voucherMenu="matMenu">
     <a mat-menu-item routerLink="/Journal">Journal</a>

overlord/src/app/core/nav-bar/nav-bar.component.ts

@@ -1,6 +1,4 @@
 import {Component, OnInit} from '@angular/core';
-import {BreakpointObserver, Breakpoints, BreakpointState} from '@angular/cdk/layout';
-import {Observable} from 'rxjs';
 import {AuthService} from '../../auth/auth.service';
 import {Subject} from 'rxjs/internal/Subject';
 
@@ -10,10 +8,9 @@ import {Subject} from 'rxjs/internal/Subject';
   styleUrls: ['./nav-bar.component.css']
 })
 export class NavBarComponent implements OnInit {
-  isHandset: Observable<BreakpointState> = this.breakpointObserver.observe(Breakpoints.Handset);
   public nameObject = new Subject<string>();
 
-  constructor(private breakpointObserver: BreakpointObserver, private auth: AuthService) {
+  constructor(private auth: AuthService) {
   }
 
   ngOnInit() {