fix: error in minimize gui windows

[raigorx]

bad ImGui::EndChild()

[raigorx]

I am not 100% sure if control flow flattenning is working as intended after this fix, can you confirm?

Here is a small program in IDA before and after apply only control flow flattenning to main function via gui

before

after

Source code

#include <iostream>
using namespace std;

int main(int argc, char** argv) {
  int a;
  cout << "Enter a number between 1 and 20: ";
  cin >> a;
  if (a == 0)
    return 1;
  else
    return 10;
  return 0;
}