Show ETH value input for payable methods (fix for solidity v0.6x)

[nicosampler]

Closes partially #1680

[github-actions]

CLA Assistant Lite All Contributors have signed the CLA.

[github-actions]

ESLint Summary View Full Report

Annotations are provided inline on the Files Changed tab. You can also see all annotations that were generated on the annotations page.

Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

---

^{Report generated by eslint-plus-action}

[ghost]

Travis automatic deployment:
https://pr1717--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1717--safereact.review.gnosisdev.com/volta/app

[ghost]

Travis automatic deployment:
https://pr1717--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1717--safereact.review.gnosisdev.com/volta/app

[ghost]

Travis automatic deployment:
https://pr1717--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1717--safereact.review.gnosisdev.com/volta/app

[francovenica]

I tried using the ABI that Tobi gave as example and the method "Deposit" showed the ETH field

[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes","name":"pubkey","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"withdrawal_credentials","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"amount","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"signature","type":"bytes"},{"indexed":false,"internalType":"bytes","name":"index","type":"bytes"}],"name":"DepositEvent","type":"event"},{"inputs":[{"internalType":"bytes","name":"pubkey","type":"bytes"},{"internalType":"bytes","name":"withdrawal_credentials","type":"bytes"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"bytes32","name":"deposit_data_root","type":"bytes32"}],"name":"deposit","outputs":[],"stateMutability":"payable","type":"function"},{"inputs":[],"name":"get_deposit_count","outputs":[{"internalType":"bytes","name":"","type":"bytes"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"get_deposit_root","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes4","name":"interfaceId","type":"bytes4"}],"name":"supportsInterface","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]

Also used a contract compiled with an older version of solidity, to make sure that old contracts still work with this fix
https://rinkeby.etherscan.io/address/0x3d7c4042365d04c98f58906966ca4c816acf592a#code
The method "Vote" also has a field with ETH that should display, and it does

I test the same scenarios in the new tx builder with the fix and it worked fine as well
safe-global/safe-react-apps#84
https://ipfs.io/ipfs/QmYES1Se6i6679z3PfQ62bydgVVEoSRUabvjB35DfUGPGA/

Looks good to me