lockd: fix typo in virtlockd-admin.socket

Commit ce7ae55e introduced a typo in virtlockd-admin socket file

/usr/lib/systemd/system/virtlockd-admin.socket:7: Unknown lvalue
'Server' in section 'Socket'

Change 'Server' to 'Service'.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>
Reviewed-by: NErik Skultety <eskultet@redhat.com>
(cherry picked from commit fb327ac2)

src/locking/virtlockd-admin.socket.in

@@ -4,7 +4,7 @@ Before=libvirtd.service
 
 [Socket]
 ListenStream=@localstatedir@/run/libvirt/virtlockd-admin-sock
-Server=virtlockd.service
+Service=virtlockd.service
 
 [Install]
 WantedBy=sockets.target