[proxy] Changed login to make_logged_in_client with is_superuser=True in proxy_test (#1158)
[proxy] Changed login to make_logged_in_client with is_superuser=True in proxy_test (#1158)

Co-authored-by: Romain Rigaux <287890a844ac6096beeae84a0888fea899cb1b3b@gmail.com>
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