fix(saml): configure prod Auth0 IDP metadata URL

Override base.ini (which points at the dev Auth0 tenant) so prod
authenticates against the production Auth0 app on auth-hivtools.unaids.org.

Author: cooper667

deploy/production.ini

@@ -3,3 +3,5 @@
 
 [app:main]
 ckanext.blob_storage.storage_service_url = https://p-giftless-e5eeh9gnhegzhed0.z01.azurefd.net
+
+ckanext.saml2auth.idp_metadata.remote_url = https://auth-hivtools.unaids.org/samlp/metadata/M3TzWiL728R3iQz3dpSy6dAsYMbtUm6T