Remove unnecessary stuff from gql query

aleksis/apps/kolego/frontend/components/helper.graphql

-query gqlAbsenceReasons($orderBy: [String], $filters: JSONString) {
-  absenceReasons(orderBy: $orderBy, filters: $filters) {
+query gqlAbsenceReasons {
+  absenceReasons {
     id
     shortName
     name
-    canEdit
-    canDelete
   }
 }