Don't migrate travellog entries from EDSM
Don't migrate travellog entries from EDSM

Don't migrate the VisitedSystems entries that were originally
synced from EDSM.  Instead, allow a later EDSM sync to
re-fetch the EDSM travellog entries.

jgoode/EDDiscovery,jgoode/EDDiscovery,vendolis/EDDiscovery,mwerle/EDDiscovery,jeoffman/EDDiscovery,mwerle/EDDiscovery,jeoffman/EDDiscovery,jthorpe4/EDDiscovery,vendolis/EDDiscovery