When the scaling method is set to FLEXIBLEAUTOEXT (Default), repeated additions produce incorrect result.

[iquah1]

Based off of [EvalAdd does not add in some cases](https://openfhe.discourse.group/t/evaladd-does-not-add-in-some-cases/517)

#include "openfhe.h"
#include <vector>
#include <iostream>

using namespace lbcrypto;
using namespace std;

int main(){

  uint32_t multDepth = 50;
  uint32_t scaleModSize = 59;
  CCParams<CryptoContextCKKSRNS> parameters;
  parameters.SetMultiplicativeDepth(multDepth);
  parameters.SetScalingModSize(scaleModSize);
  CryptoContext<DCRTPoly> cc = GenCryptoContext(parameters);
  cc->Enable(PKE);
  cc->Enable(LEVELEDSHE);
  auto keys = cc->KeyGen();
  auto val = cc->Encrypt(keys.publicKey, cc->MakeCKKSPackedPlaintext(vector < double > {1}));
  for (int i = 0; i < 41; i++) {
    auto added = cc->EvalAdd(val, i);
    Plaintext p;
    cc->Decrypt(keys.secretKey, added, &p);
    p->SetLength(1);
    cout << "Added " << to_string(i) << ":\t" << p << endl;
  }
}

You'll see that after the first few iterations (which produce the correct result), we start encountering the wrong result

[yspolyakov]

I verified that this example works (also for smaller depths and scaling factors) as long as the scaling mode is to FIXEDMANUAL, FIXEDAUTO, or FLEXIBLEAUTO.

[yspolyakov]

Caused by the same bug as #393