test: fix addTxSignatures test (#814)

Author: bferenc

src/signer/addTxSignatures.spec.ts

@@ -74,14 +74,12 @@ describe('addTxSignatures', () => {
     expect(hasPubkeySpy).toHaveBeenNthCalledWith(3, unknownPublicKey);
 
     expect(addSignatureSpy).toHaveBeenCalledTimes(2);
-    expect(addSignatureSpy).toHaveBeenNthCalledWith(
-      1,
+    expect(addSignatureSpy).toHaveBeenCalledWith(
       hexToBuffer(
         '0x7b3da43d8e4103d1078061872075cbcbb5de0108f3d897752c894757cf0e9c4113949ca2a5568483763e1fa0e74b4f4dd9b2a6e40909d0729f87c7dddfc1e70601',
       ),
     );
-    expect(addSignatureSpy).toHaveBeenNthCalledWith(
-      2,
+    expect(addSignatureSpy).toHaveBeenCalledWith(
       hexToBuffer(
         '0x04e2072e34fd5d7cc729afb8bfe7c5865754c3c448b9b3247b16cabbf06378393edf405274048bef74c02862ae032c0b86dda7c28bebf63f4d1de4f517bd710500',
       ),