Fix missing weiValue in transaction when estimating gas for payable function

[liulinhui]

What does this PR do?

to fix #1268

Fix an issue where the weiValue is not set in the constructed transaction during gas estimation for a payable function, which leads to failure.

Where should the reviewer start?

org.web3j.tx.Contract

Why is it needed?

When estimating gas for a payable function, the transaction must include the correct weiValue to reflect the actual call conditions. Without setting the weiValue, the gas estimation does not accurately represent a real invocation, and in many contracts, this leads to a revert or failure during the estimation phase.

This fix ensures the weiValue is properly included in the transaction used for gas estimation, which allows the estimation to succeed and reflect real execution costs.

Checklist

• I've read the contribution guidelines.
• I've added tests (if applicable).
• I've added a changelog entry if necessary.

[FangshuoCao]

I’ve tested this fix on Sepolia using a simple payable contract (deposit() with require(msg.value > 0)) and confirmed that gas estimation now correctly includes the weiValue. This should be good to go.