Remove windowClass in modal open.

src/operations/operationRow.component.ts

@@ -139,9 +139,7 @@ export class OperationRowComponent {
 
   modify(operation) {
     // FIXME Alexis Lahouze 2017-06-15 i18n
-    const modal = this.ngbModal.open(OperationEditModalComponent, {
-      windowClass: 'in'
-    });
+    const modal = this.ngbModal.open(OperationEditModalComponent);
 
     modal.componentInstance.operation = operation;