Fix transaction benchmark (#886)

We need to give the accounts more coins!!

cumulus/test/service/benches/transaction_throughput.rs

@@ -71,7 +71,7 @@ fn create_account_extrinsics(client: &Client, accounts: &[sr25519::Pair]) -> Vec
 						call: Box::new(
 							BalancesCall::set_balance {
 								who: AccountId::from(a.public()).into(),
-								new_free: 1_000_000 * ExistentialDeposit::get(),
+								new_free: 1_000_000_000_000 * ExistentialDeposit::get(),
 								new_reserved: 0,
 							}
 							.into(),