test: fixed use of `client.host` in legacy test: those tests are not maintained anymore, but as the use of `client.host` as been fixed elsewhere, it was the occasion to do it there too. Those legacy tests should be ported or to the new workflow, or deleted if they are not relevant anymore.

[component file_sharing]
tls_certificate = /usr/share/sat/certificates/server1.test.pem
tls_private_key = /usr/share/sat/certificates/server1.test-key.pem
http_upload_public_facing_url = https://sat.test:8888