test(managed): align source goldens with metadata validation

Fixes #6650

src/dotnet/ManagedCilDecoding.test.ts

@@ -211,6 +211,7 @@ describe("managed CIL decoding", () => {
     fatHeader.writeUInt32LE(il.length, 4);
     fatHeader.writeUInt32LE(0x1100_0001, 8);
     const fatBytes = buildManagedPeFixture({
+      standaloneSignatures: [Buffer.from([0x07, 0x01, 0x08])],
       ilBody: Buffer.concat([fatHeader, il]),
     });
     const tiny = inspectManagedMembersBytes(