Move LES to Advanced Landing tech node (Level 6)

For #80.

All other SDHI SMS parts are in Level 6 tech nodes.

Author: Robin Chang

GameData/SDHI/Service Module System/Parts/SDHI_LES/part.cfg

@@ -12,7 +12,7 @@ PART
 	// definition format is Position X, Position Y, Position Z, Up X, Up Y, Up Z, Node Size
 	node_stack_bottom = 0.0, -2.0, 0.0, 0.0, -1.0, 0.0, 1
 
-    TechRequired = largeControl
+    TechRequired = advLanding
     entryCost = 5600
     cost = 1800
     category = Utility