Fix node executor ullage

should allow people to manually ullage and should now check for the
proper boolean and actually do RCS ullage in the LEAD time state for
you.

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>

MechJeb2/MechJebModuleNodeExecutor.cs

@@ -134,9 +134,7 @@ private void DoRCS(FlightCtrlState s)
             if (State != States.LEAD || RCSOnly)
                 return;
 
-            s.Z = 0.0F;
-
-            if (!Core.Thrust.LimitToPreventUnstableIgnition || VesselState.lowestUllage == VesselState.UllageState.VeryStable)
+            if (!Core.Thrust.AutoRCSUllaging || VesselState.lowestUllage == VesselState.UllageState.VeryStable)
                 return;
 
             if (!Vessel.hasEnabledRCSModules())