Fix list sort by age (#276)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

dashboard/client/components/+storage-classes/storage-classes.tsx

@@ -30,7 +30,7 @@ export class StorageClasses extends React.Component<Props> {
         store={storageClassStore} isClusterScoped
         sortingCallbacks={{
           [sortBy.name]: (item: StorageClass) => item.getName(),
-          [sortBy.age]: (item: StorageClass) => item.getAge(false),
+          [sortBy.age]: (item: StorageClass) => item.metadata.creationTimestamp,
           [sortBy.provisioner]: (item: StorageClass) => item.provisioner,
           [sortBy.reclaimPolicy]: (item: StorageClass) => item.reclaimPolicy,
         }}
@@ -69,4 +69,4 @@ export function StorageClassMenu(props: KubeObjectMenuProps<StorageClass>) {
 
 apiManager.registerViews(storageClassApi, {
   Menu: StorageClassMenu,
-})
+})