test: set correct group for systemd-journal-upload tests

We can't use the systemd-journal-upload user here, since it's created
dynamically by DynamicUser=yes. However, we can use the group specified
in SupplementaryGroups=, so do exactly that.

test/units/testsuite-04.journal-remote.sh

@@ -161,8 +161,8 @@ openssl x509 -req -days 7 \
              -CA /run/systemd/remote-pki/ca.crt \
              -CAkey /run/systemd/remote-pki/ca.key \
              -out /run/systemd/remote-pki/server.crt
-setfacl -R -m "u:systemd-journal-remote:rwX" /run/systemd/remote-pki
-setfacl -R -m "u:systemd-journal-upload:rwX" /run/systemd/remote-pki
+chown -R systemd-journal-remote:systemd-journal /run/systemd/remote-pki
+chmod -R g+rwX /run/systemd/remote-pki
 
 # Reconfigure journal-upload/journal remote with the new keys
 cat >/run/systemd/journal-remote.conf.d/99-test.conf <<EOF
@@ -215,7 +215,8 @@ cat >/run/systemd/system/systemd-journal-upload.service.d/99-test.conf <<EOF
 Restart=no
 EOF
 systemctl daemon-reload
-setfacl -R -m "u:systemd-journal-upload:rwX" /run/systemd/journal-remote-tls
+chgrp -R systemd-journal /run/systemd/journal-remote-tls
+chmod -R g+rwX /run/systemd/journal-remote-tls
 
 systemctl restart systemd-journal-upload
 timeout 10 bash -xec 'while [[ "$(systemctl show -P ActiveState systemd-journal-upload)" != failed ]]; do sleep 1; done'