improve error message when wrong wallet is opened

[Hecate2]

Description

Improve error message when user want to sign a transaction with a wrong wallet opened.

Type of change

• Style (the change is only a code style for better maintenance or standard purpose)

How Has This Been Tested?

No additional test is made. You can open a wallet A in RpcServer but invokefunction with another different signer B, in order to see the error message.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[Jim8y]

need update test Assert.AreEqual failed. Expected:<"The smart contract or address 0x953fc2959bc7ddace714ccc961374a1e1edc602d (NQ3udKxL4kSyKTkXwBWFMjttdRJzgQtbPn) is not found. If this is your wallet address and you want to sign a transaction with it, make sure you have opened this wallet.">. Actual:<"The smart contract or address 0x953fc2959bc7ddace714ccc961374a1e1edc602d is not found">.