Fix error on token number input

[tantely-klaytn]

Describe the bug When a user insert a number of token to send, some numbers are not accepted on the UI due to an uncommon behavior of the input form.

How to reproduce

• Deploy a KIP7 token
• Use the KIP7 contract
• Insert a receiving address
• Insert a number of token to send other than 1, 10, 100, 1000, 10000,.... Eg: 3, 5, 29, 35

Expected behavior Every number below connected address's balance should be accepted