Update the FMN SSE unit file
Update the FMN SSE unit file

The file name was changed to just 'server.py' as part of
https://github.com/fedora-infra/fmn.sse/pull/52.

Signed-off-by: Jeremy Cline <b3f594e10a9edcf5413cf1190121d45078c62290@jcline.org>

jeremycline/fmn,jeremycline/fmn,jeremycline/fmn