fix test compile

Author: liamaharon

pallets/subtensor/src/tests/registration.rs

@@ -1,7 +1,10 @@
 #![allow(clippy::unwrap_used)]
 
+use crate::DispatchClass;
+use crate::Pays;
 use approx::assert_abs_diff_eq;
 use frame_support::dispatch::DispatchInfo;
+use frame_support::dispatch::GetDispatchInfo;
 use frame_support::sp_runtime::{DispatchError, transaction_validity::TransactionSource};
 use frame_support::traits::Currency;
 use frame_support::{assert_err, assert_noop, assert_ok};