Revise MH Part Hiding patch

Adjust TechHidden key to be created if it doesn't exist already for part and delete contract node for parts that are being hidden.

Distribution/RestockPlus/GameData/ReStockPlus/Patches/MakingHistoryPartHiding.cfg

@@ -1,7 +1,8 @@
 // Hides all the MH replacing parts if MH is installed
 @PART[*]:HAS[#MHReplacement[True]]:FOR[zzReStockPlus]:NEEDS[SquadExpansion/MakingHistory]
 {
-  @TechHidden = True
+  %TechHidden = True
   @category = none
   @subcategory = 0
+  !MODULE[ModuleTestSubject] {}
 }