nixos/weblate: run the integration test without --deploy for now

Changed files
+1
nixos
tests
web-apps
+1
nixos/tests/web-apps/weblate.nix
···
# TODO: Check sending and receiving email.
# server.wait_for_unit("postfix.service")
+
server.succeed("sudo -iu weblate -- weblate check")
# TODO: The goal is for this to succeed, but there are still some checks failing.
# server.succeed("sudo -iu weblate -- weblate check --deploy")
'';