Make Pluto space low above the atmosphere

See previous commit

GameData/RealSolarSystem/RSSKopernicus/Pluto/Pluto.cfg

@@ -197,7 +197,7 @@
 				inSpaceHighDataValue = 10
 				recoveryValue = 11
 				flyingAltitudeThreshold = 18000
-				spaceAltitudeThreshold = 100000
+				spaceAltitudeThreshold = 375000  //about the same as Triton?
 			}
 
 		}