Moves all test runtimes to use derive_impl (#2409)

Step in https://github.com/paritytech/polkadot-sdk/issues/171

This PR adds `derive_impl` on all `frame_system` config impls for mock
runtimes. The overridden configs are maintained as of now to ensure
minimal changes.

---------

Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

substrate/frame/child-bounties/src/tests.rs

@@ -23,7 +23,7 @@ use super::*;
 use crate as pallet_child_bounties;
 
 use frame_support::{
-	assert_noop, assert_ok, parameter_types,
+	assert_noop, assert_ok, derive_impl, parameter_types,
 	traits::{
 		tokens::{PayFromAccount, UnityAssetBalanceConversion},
 		ConstU32, ConstU64, OnInitialize,
@@ -62,6 +62,7 @@ parameter_types! {
 
 type Balance = u64;
 
+#[derive_impl(frame_system::config_preludes::TestDefaultConfig as frame_system::DefaultConfig)]
 impl frame_system::Config for Test {
 	type BaseCallFilter = frame_support::traits::Everything;
 	type BlockWeights = ();