mod_storage_appendmap: Fix keyvalue writes store_raw() takes a filename, unlike most other datamanager functions that take a series of path components, leading to this bug where it would write the hostname into a file named after the first argument (commonly a username) in the working directory.

[Install]
WantedBy=sockets.target

[Socket]
ListenStream=0.0.0.0:5269
ListenStream=5269
BindIPv6Only=ipv6-only
Accept=false
Service=prosody.service