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/asset-conversion/src/mock.rs

@@ -21,7 +21,7 @@ use super::*;
 use crate as pallet_asset_conversion;
 
 use frame_support::{
-	construct_runtime,
+	construct_runtime, derive_impl,
 	instances::{Instance1, Instance2},
 	ord_parameter_types, parameter_types,
 	traits::{AsEnsureOriginWithArg, ConstU128, ConstU32, ConstU64},
@@ -48,6 +48,7 @@ construct_runtime!(
 	}
 );
 
+#[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 = ();