SEP24WithdrawAsset constructor Null safety
Implementation
SEP24WithdrawAsset(this.enabled, this.minAmount, this.maxAmount,
this.feeFixed, this.feePercent, this.feeMinimum);
SEP24WithdrawAsset(this.enabled, this.minAmount, this.maxAmount,
this.feeFixed, this.feePercent, this.feeMinimum);