fix(operators): Show active menu entry

Author: feloy

src/app/operators/operators.component.html

@@ -11,7 +11,8 @@
       <h3 mat-subheader class="category-subheader">{{ category }}</h3>
       <a mat-list-item
         *ngFor="let operator of groupedOperators[category]"
-        [routerLink]="['/operators', operator.name]">
+        [routerLink]="['/operators', operator.name]"
+        routerLinkActive="active">
         {{ operator.name }}
       </a>
     </mat-nav-list>