VOID_Data: Resource mass values reverted to use VesselSimulator's fields again.
VOID_Data: Resource mass values reverted to use VesselSimulator's fields again.

--- a/VOID_Data.cs
+++ b/VOID_Data.cs
@@ -269,7 +269,7 @@
 						return double.NaN;
 					}
 
-					return Core.LastStage.totalMass - Core.LastStage.totalBaseMass;
+					return Core.LastStage.totalResourceMass;
 				},
 				"tons"
 			);
@@ -284,7 +284,7 @@
 						return double.NaN;
 					}
 
-					return Core.LastStage.mass - Core.LastStage.baseMass;
+					return Core.LastStage.resourceMass;
 				},
 				"tons"
 			);