OZG-7473 remove unnecessary binding

Based on CR comment.

alfa-client/libs/admin/aggregation-mapping/src/lib/aggregation-mapping-form-container/aggregation-mapping-form/aggregation-mapping-field-list-form/aggregation-mapping-field-list-form.component.html

 <form [formGroup]="formService.form">
-  <div class="flex flex-col" [formArrayName]="AggregationMappingFormService.FIELD_MAPPINGS">
     <div *ngFor="let ignore of mappingsFormArray; let i = index">
       <admin-aggregation-mapping-field-form
         [index]="i"
         [attr.data-test-id]="'aggregation-mapping-field-mapping-form-' + i"
       ></admin-aggregation-mapping-field-form>
     </div>
-  </div>
 </form>