change livestock quota allocations quantity to int - change rancher statistics from decimal to int

apps/product/models.py

@@ -497,7 +497,7 @@ class QuotaLivestockAllocation(BaseModel):
         null=True
     )
     livestock_subtype = models.CharField(max_length=20, choices=LivestockSubtype.choices, null=True)
-    quantity_kg = models.DecimalField(max_digits=12, decimal_places=2, null=True)
+    quantity_kg = models.PositiveBigIntegerField(default=0)
 
     """ 
     @using for set unique values between fields