Fix skeletons not becoming skulls on gib (#36571)

Resources/Prototypes/Body/Parts/skeleton.yml

@@ -14,7 +14,6 @@
         ents: []
   - type: StaticPrice
     price: 20
-  - type: Gibbable
   - type: Tag
     tags:
       - Trash
@@ -37,7 +36,7 @@
   id: HeadSkeleton
   name: "skull"
   description: Alas poor Yorick...
-  parent: PartSkeleton
+  parent: [ PartSkeleton, BaseMob ]
   components:
     - type: Sprite
       sprite: Mobs/Species/Skeleton/parts.rsi
@@ -47,10 +46,12 @@
       state: "skull_icon"
     - type: BodyPart
       partType: Head
+    - type: BlockMovement
     - type: Input
       context: "human"
     - type: Speech
       speechVerb: Skeleton
+      speechSounds: Alto
     - type: SkeletonAccent
     - type: Actions
     - type: Vocal