Adding hash via `signWithParams` result in error due to duplicating args

[ShGKme]

No matter what options you have, signWithSignTool always adds hashing/timestampServer params.

windows-sign/src/sign-with-signtool.ts

Lines 25 to 31 in 2605684

	// Timestamp
	if (hash === HASHES.sha256) {
	args.push('/tr', timestampServer);
	args.push('/td', hash);
	} else {
	args.push('/t', timestampServer);
	}

Then if you signWithParams with the same params (e.g. /td sha256), signing results in error because duplicating params in signtool is not allowed.

I think this would be good if developers can provide any params in signWithSignTool. Especially because README makes a feeling it is possible:

windows-sign/README.md

Lines 231 to 237 in 2605684

	To sign with `@electron/windows-sign` using those instructions, you would take the parameters and add them to `signWithParams`:
	```js
	await sign({
	signWithParams: "/csp \"DigiCert Signing Manager KSP\" /kc <keypair_alias> /f <certificate_file> /tr http://timestamp.digicert.com /td SHA256 /fd SHA256"
	})
	```

Probably related: Squirrel/Squirrel.Windows#1742

---

Proposal

After parsing signWithParams, replace duplicating params.

If this is fine, I'm ready to make a PR.