make set diff only root

Author: camfairchild

pallets/admin-utils/src/lib.rs

@@ -653,7 +653,7 @@ pub mod pallet {
             netuid: u16,
             difficulty: u64,
         ) -> DispatchResult {
-            pallet_subtensor::Pallet::<T>::ensure_subnet_owner_or_root(origin, netuid)?;
+            ensure_root(origin)?;
             ensure!(
                 pallet_subtensor::Pallet::<T>::if_subnet_exist(netuid),
                 Error::<T>::SubnetDoesNotExist