fix remove stake weight

Author: open-junius

chain-extensions/src/lib.rs

@@ -104,9 +104,7 @@ where
             .map_err(|_| DispatchError::Other("Failed to decode input parameters"))?;
 
         // weight for remove_stake is not defined in the Subtensor pallet's WeightInfo
-        let weight = Weight::from_parts(196_800_000, 0)
-            .saturating_add(T::DbWeight::get().reads(19))
-            .saturating_add(T::DbWeight::get().writes(10));
+        let weight = <<T as pallet_subtensor::Config>::WeightInfo as SubtensorWeightInfo>::remove_stake();
 
         env.charge_weight(weight)?;