[#326] ir: Change construction of Balance contact client

Use client with extraFee instead of readOnlyFee. Rename
NewNoFeeBalanceClient to NewBalanceClient since no-fee client is no longer
used.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/innerring/innerring.go

@@ -404,7 +404,7 @@ func New(ctx context.Context, log *zap.Logger, cfg *viper.Viper) (*Server, error
 		return nil, err
 	}
 
-	balClient, err := invoke.NewNoFeeBalanceClient(server.morphClient, server.contracts.balance)
+	balClient, err := invoke.NewBalanceClient(server.morphClient, server.contracts.balance)
 	if err != nil {
 		return nil, err
 	}