Form validation already matches token decimals. However, default step for number inputs if not specified is 1. This means a user will see a form error if they try to send a decimal fraction of a token, even though the send will be successful. This diff patches the bug by adjusting step to match token decimal places.

npm start, go to send a token, observe that scrolling over the 'Amount' field increments the value by decimal places of SLPA token to be sent