Replace T::AccountId with <T::Lookup as StaticLookup>::Source (#11670)

* initial

* update

* update

* update

* cargo fmt

* update

* update benchmarks

* AccountIdLookupOf<T>

* cargo fmt

* fix conflits

* cargo fmt

* update

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

substrate/frame/elections-phragmen/src/lib.rs

@@ -176,6 +176,8 @@ pub struct SeatHolder<AccountId, Balance> {
 
 pub use pallet::*;
 
+type AccountIdLookupOf<T> = <<T as frame_system::Config>::Lookup as StaticLookup>::Source;
+
 #[frame_support::pallet]
 pub mod pallet {
 	use super::*;
@@ -508,7 +510,7 @@ pub mod pallet {
 		})]
 		pub fn remove_member(
 			origin: OriginFor<T>,
-			who: <T::Lookup as StaticLookup>::Source,
+			who: AccountIdLookupOf<T>,
 			slash_bond: bool,
 			rerun_election: bool,
 		) -> DispatchResultWithPostInfo {