disallow stacking polymorphs by default (#9845)

Co-authored-by: Kara <lunarautomaton6@gmail.com>

Resources/Prototypes/Polymorphs/admin.yml

@@ -5,33 +5,39 @@
   transferName: true
   transferHumanoidAppearance: true
   inventory: Transfer
+  allowRepeatedMorphs: true
 
 - type: polymorph
   id: AdminMonkeySmite
   entity: MobMonkey
   forced: true
   inventory: Drop
+  allowRepeatedMorphs: true
 
 - type: polymorph
   id: AdminBreadSmite
   entity: FoodBreadPlain
   forced: true
   inventory: Drop
+  allowRepeatedMorphs: true
 
 - type: polymorph
   id: AdminInstrumentSmite
   entity: SuperSynthesizerInstrument
   forced: true
   inventory: Drop
+  allowRepeatedMorphs: true
 
 - type: polymorph
   id: AdminMouseSmite
   entity: MobMouse
   forced: true
   inventory: Drop
+  allowRepeatedMorphs: true
 
 - type: polymorph
   id: AdminDisposalsSmite
   entity: DisposalUnit
   forced: true
   inventory: Drop
+  allowRepeatedMorphs: true