EDSMClass.cs: update atmosphere conversion factor
EDSMClass.cs: update atmosphere conversion factor

Use new public const in JournalScan.cs for Atmospheres -> Pascals.
EDDiscovery/EDDiscovery,EDDiscovery/EDDiscovery,andreaspada/EDDiscovery,klightspeed/EDDiscovery,klightspeed/EDDiscovery,klightspeed/EDDiscovery,EDDiscovery/EDDiscovery,andreaspada/EDDiscovery