fix: sort instance-backups list by date

Author: Cyrille Bourgois

packages/manager/modules/pci/src/projects/project/storages/instance-backups/instance-backups.html

@@ -11,7 +11,7 @@ <h1 data-translate="pci_projects_project_storages_instance-backups_title"></h1>
             data-property="name"
             data-type="string"
             data-searchable
-            data-sortable="asc"
+            data-sortable
             data-filterable></oui-column>
         <oui-column
             data-title="'pci_projects_project_storages_instance-backups_region_label' | translate"
@@ -33,7 +33,7 @@ <h1 data-translate="pci_projects_project_storages_instance-backups_title"></h1>
             data-title=":: 'pci_projects_project_storages_containers_container_creationDate_label' | translate"
             data-property="creationDate"
             data-type="date"
-            data-sortable
+            data-sortable="desc"
             data-filterable>
             <span data-ng-bind="$value | date:'medium'"></span>
         </oui-column>