fix: sign addpkg with empty deposit

[luciorubeens]

Signing a transaction with a empty deposit field causes the following error:

const msg = MsgAddPackage.create({
  deposit: "",
  package: MemPackage.create({
    name: "hello",
    path: "gno.land/r/demo/hello",
    files: [
		// ...
    ],
  }),
});

 log: '--= Error =--\n' +
'Data: std.UnauthorizedError{abciError:std.abciError{}}\n' +
'Msg Traces:\n' +
'    0  /opt/build/pkgs/std/errors.go:70 - signature verification failed; verify correct account sequence and chain-id\n' +
'Stack Trace:\n' +
'    0  /opt/build/pkgs/errors/errors.go:20\n' 

Kudos to the Onbloc team for quickly identifying the issue.

[zivkovicmilos]

This is a good catch 💯

Thank you for adding the fix 🙏
I'll merge it in, and do a release so it's live

[zivkovicmilos]

Published as the package version to NPM as 1.2.1
@luciorubeens @jinoosss