Change error for handleTransaction

[ahessert]

Raw aurora error for Insufficient funds:

'{"value":{"code":-32603,"data":{"code":3,"message":"ERC20: transfer amount exceeds balance","data":{"host":"r002.westcoast.us.testnet.internal.aurora.dev","cf-ray":"6e5f65fc01178220-IAD"}}}}'

Aurora testnet erratic error:

'{"value":{"code":-32603,"data":{"code":-32603,"message":"Internal Error - Error: The account aurora wouldn't have enough balance to cover storage, required to have 8044136139142612403008 yoctoNEAR more. Please report a bug at <https://github.com/aurora-is-near/aurora-relayer/issues>","data":{"host":"r001.eastcoast.us.testnet.internal.aurora.dev","cf-ray":"6e5f3c71e3e28220-IAD"}}}}'