Fix: Changed encodedTx

[StarGachinum]

Resolved issue #1442 .
Changed const encodedTx = transaction.encode();
to const encodedTx = new Uint8Array(sha256.sha256.array(transaction.encode()));

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[gagdiez]

I see that actually signMessage already applies the sha256, so maybe instead of changing the payload being signed, we just need to clarify what signMessage does on its String, and add a test

simply changing this code without a proper test would lead to more errors down the line

[gagdiez]

I see that actually signMessage already applies the sha256, so maybe instead of changing the payload being signed, we just need to clarify what signMessage does on its String, and add a test

simply changing this code without a proper test would lead to more errors down the line