Do not allow zero Existential Deposit when using Balances (#4894)

* Add non-zero ed check on Balances genesis

* Update ED from 0 to 1

* bump impl

* bump spec

* Found remove more ed = 0

* Fix some contract tests

* Use ctx.overlay.set_balance for contracts

* Fix staking test

* Remove obsolete logic

* Allow death of payout account in society

* Update frame/balances/src/lib.rs

Co-Authored-By: Bastian Köcher <bkchr@users.noreply.github.com>

* Dont create genesis balances if balance is zero in transaction payment pallet

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Gavin Wood <github@gavwood.com>

substrate/frame/balances/src/lib.rs

@@ -394,6 +394,10 @@ decl_storage! {
 		config(balances): Vec<(T::AccountId, T::Balance)>;
 		// ^^ begin, length, amount liquid at genesis
 		build(|config: &GenesisConfig<T, I>| {
+			assert!(
+				<T as Trait<I>>::ExistentialDeposit::get() > Zero::zero(),
+				"The existential deposit should be greater than zero."
+			);
 			for (_, balance) in &config.balances {
 				assert!(
 					*balance >= <T as Trait<I>>::ExistentialDeposit::get(),