fix(wasm-solana): correct expected tx.id values in test

Update test assertions to check for undefined instead of "UNSIGNED"
for the initial transaction ID.

Issue: BTC-0

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

packages/wasm-solana/test/versionedBuilder.ts

@@ -153,15 +153,15 @@ describe("buildFromVersionedData", () => {
     const tx = buildFromVersionedData(data);
 
     // Initially unsigned
-    assert.strictEqual(tx.id, "UNSIGNED");
+    assert.strictEqual(tx.id, undefined);
 
     // Add signature
     const signature = new Uint8Array(64);
     for (let i = 0; i < 64; i++) signature[i] = i + 1;
     tx.addSignature(feePayer, signature);
 
     // Now signed
-    assert.notStrictEqual(tx.id, "UNSIGNED");
+    assert.notStrictEqual(tx.id, undefined);
     assert.ok(tx.id.length > 20);
   });
 });