Execute contract call button disabled for non-mutating + payable message

[cmichi]

Folllow-up to https://github.com/polkadot-js/apps/issues/5751:

Thanks for implementing this! I'm having the following issue though:

• I deploy contract_transfer.contract.zip.
• I expand the messages for that contract and click the Read button next to wasItTen().
• The dialog shows up and I enter 10 into value.
• The Execute button is still greyed out.

If I switch the message to send in the dialog to giveMe (a mutating message) and then back to wasItTen() the Execute button becomes activated.

I just tried on the latest published version.