Can not send TIIM trc21

[thanhson1085]

TIIM trc21, fee 0
https://scan.tomochain.com/tokens/0x3c6475f8b4200e0a6acf5aeb2b44b769a3d37216

[thanhvk]

Root cause:

• tomodex use minFee function to get transaction fee
• TIIM have a estimateFee function extends from TRC21

Solution: We'll replace the minFee function by estimateFee