Move service dispatch daemon after the source service

Service dispatch daemon depends on the source service, so it has to
start after it.

Signed-off-by: Andrej Shadura <andrew.shadura@collabora.co.uk>

docker/services/backend/obsservicedispatch.conf

@@ -4,7 +4,7 @@ directory=/usr/lib/obs/server/
 stdout_logfile=/srv/obs/log/servicedispatch.log
 redirect_stderr=true
 autostart=True
-priority=1
+priority=4
 startretries=100
 stopsignal=KILL
 killasgroup=true