update product order link in actions column to reference product orders instead of service orders

                            <ng-container matColumnDef="actions">

                                <th mat-header-cell *matHeaderCellDef>Actions</th>

                                <td mat-cell *matCellDef="let element">

                                    <a routerLink='/{{appService.portalDomain}}/service_order/{{element.id}}'>

                                    <a routerLink='/{{appService.portalDomain}}/product_order/{{element.id}}'>

                                        <button class="btn btn-primary btn-sm m-1" ><i class="fas fa-search"></i></button>

                                    </a>

                                    <button *ngIf="authService.portalUserJWT?.realm_access.roles.includes('ADMIN')" class="btn btn-danger btn-sm m-1" (click)="openOrderDeleteDialog(element)"><i class="far fa-trash-alt"></i></button>