fix: check user permission on bg-import and bg-export

src/classes/api/endpoints/class-tainacan-rest-exporters-controller.php

@@ -111,7 +111,7 @@ class REST_Exporters_Controller extends REST_Controller {
 	 * @throws \Exception
 	 */
 	public function  export_permissions_check($request) {
-		return true;
+		return current_user_can('manage_tainacan');
 	}
 
 	public function get_registered_exporters() {

src/classes/api/endpoints/class-tainacan-rest-importers-controller.php

@@ -137,7 +137,7 @@ class REST_Importers_Controller extends REST_Controller {
 	 */
 	public function  import_permissions_check($request){
 		// TODO
-		return true;
+		return current_user_can('manage_tainacan');
 	}
 
 	/**