Add default icon to feeds

Every feed has an icon. If not set by the user, the database
automatically sets the default icon to media/default-icon-svg.

frontend/src/app/component/einstellungen/einstellungen.component.ts

@@ -1,11 +1,11 @@
 import {Component, OnInit} from '@angular/core';
 import {HttpClient} from '@angular/common/http';
-import {Observable, throwError} from 'rxjs';
+import {throwError} from 'rxjs';
 import {MatSnackBar} from '@angular/material/snack-bar';
 import {NGXLogger} from 'ngx-logger';
 import {IFeed} from '../../interfaces/feed.interface';
 import {FeedService} from '../../services/feed.service';
-import {ActivatedRoute, NavigationEnd, Router} from '@angular/router';
+import {ActivatedRoute} from '@angular/router';
 
 @Component({
   selector: 'app-einstellungen',
@@ -22,10 +22,8 @@ export class EinstellungenComponent implements OnInit {
               private _snackbar: MatSnackBar,
               private _logger: NGXLogger,
               private _feedService: FeedService,
-              private _route: ActivatedRoute,
-              private _router: Router) {
+              private _route: ActivatedRoute) {
     this.icon = 'assets/logo.svg';
-    this._router.routeReuseStrategy.shouldReuseRoute = () => false;
     this._feedService.getFeeds().toPromise().then(data => this.feeds = data).catch(err => this._logger.error(err));
   }