message: test: Fix spectest failure output
diff: @@ -492,8 +492,8 @@ private:
  std::stringstream message;
  message << "Incorrect returned value. Expected: " << expected_value.i64 << " (0x"
  << std::hex << expected_value.i64 << ")"
  - << " Actual: " << actual_value.i64 << " (0x" << std::hex << actual_value.i64
  - << ")";
  + << " Actual: " << std::dec << actual_value.i64 << " (0x" << std::hex
  + << actual_value.i64 << ")";
  fail(message.str());
  return false;
  }
  