Move extruder offset back into baby step stream as it is always required

make sure we return the offsets for extruder 0 (needed for z offset)
Remove unused offset stream

issue:
MatterHackers/MCCentral#5150
re-slice not propogating final extruder through the stack correctly

MatterControl.Printing/Settings/SettingsHelpers.cs

@@ -216,11 +216,6 @@ namespace MatterHackers.MatterControl.SlicerConfiguration
 
 		public Vector3 ExtruderOffset(int extruderIndex)
 		{
-			if(extruderIndex == 0)
-			{
-				return Vector3.Zero;
-			}
-
 			string currentOffsets = printerSettings.GetValue(SettingsKey.extruder_offset);
 			string[] offsets = currentOffsets.Split(',');
 			int count = 0;