Fix Prize Balls' Pet Rock (#831)

# Description


This PR fixes an undetected bug in Prize Balls where an error would
occur if a prize ball tried to give out a BasePetRock.

---

No CL No Fun

Signed-off-by: ShatteredSwords <135023515+ShatteredSwords@users.noreply.github.com>
Co-authored-by: DEATHB4DEFEAT <77995199+DEATHB4DEFEAT@users.noreply.github.com>

Resources/Prototypes/Entities/Objects/Fun/prizeticket.yml

@@ -282,7 +282,7 @@
       - id: CrayonBox
         prob: 0.80
         orGroup: Prize
-      - id: BasePetRock
+      - id: PetRock
         prob: 0.80
         orGroup: Prize
       # Uncommon
@@ -392,4 +392,4 @@
       - id: ThronglerToy
         prob: 0.30
         orGroup: Prize
-
+