Reduce side fairing mass

For #94.

Author: Robin Chang

GameData/SDHI/Service Module System/Parts/SDHI_2.5_ServiceModuleFairing/part.cfg

@@ -28,7 +28,7 @@ PART
 	attachRules = 1,0,1,1,1
 	stackSymmetry = 1
 
-	mass = 0.1
+	mass = 0.0666666
 	dragModelType = default
 	maximum_drag = 0.001
 	minimum_drag = 0.001