sign command for multisigaddress is not working when including unicode

[superboyiii]

Describe the bug
sign command for multisigaddress is not working when handling unicode like \u002B. We should still keep behaviour compatiblity like what it used to be.

To Reproduce
Steps to reproduce the behavior:

1. create a multisigaddress, send some gas into it
2. transfer gas from this multisig address to one of these adresses
3. address A output context
4. address B sign it

Expected behavior
It's always working, some changes in current dev made it broken.

Screenshots

If I revert these unicode to base64, it could work:

[Jim8y]

analysising

[shargon]

Good catch

[Wi1l-B0t]

Unicode escaping has never been handled.

I will fix it soon

[Wi1l-B0t]

Fixed