add two missing biker trainer headers

original-commit-id: 2f470415e18afa2e1274c19ada09a04c88a9337b

crystal.py

@@ -3551,6 +3551,9 @@ class TrainerGroupHeader:
         elif self.group_id == 0x29:
             # there's a missing supernerd :(
             max_id += 1
+        elif self.group_id == 0x2D:
+            # missing bikers
+            max_id += 2
 
         for trainer_id in range(min_id, max_id+1):
             trainer_header = TrainerHeader(address=current_address, trainer_group_id=self.group_id, trainer_id=trainer_id, parent=self)