Fix typo in revalidate script

Co-authored-by: Mike VanDenburgh <37340715+mvandenburgh@users.noreply.github.com>

dandiapi/api/management/commands/revalidate.py

@@ -7,7 +7,7 @@
 @click.command()
 @click.option('--assets', is_flag=True, default=False)
 @click.option('--versions', is_flag=True, default=False)
-def refresh_metadata(assets: bool, versions: bool):
+def revalidate(assets: bool, versions: bool):
     """
     Revalidate all Versions and Assets.