fix bug in read_file_binary(FILE *fp, std::vector<uint8_t> &fileBufferBytes)

[fabyday]

Fixes # .

add fclose(File* fp).

from in file_utils.cpp

  if (!ferror(fp)) {
    fseek(fp, 0, SEEK_END);
    size_t sizeBytes = ftell(fp);
    fseek(fp, 0, SEEK_SET);
    fileBufferBytes.resize(sizeBytes);

    if (fread((char*)fileBufferBytes.data(), 1, sizeBytes, fp) == sizeBytes) 
      return;
  }

to

  if (!ferror(fp)) {
    fseek(fp, 0, SEEK_END);
    size_t sizeBytes = ftell(fp);
    fseek(fp, 0, SEEK_SET);
    fileBufferBytes.resize(sizeBytes);

    if (fread((char*)fileBufferBytes.data(), 1, sizeBytes, fp) == sizeBytes) {
      fclose(fp);
      return;
    }
  }

Checklist

• All changes meet libigl style-guidelines.
• Adds new .cpp file.
• Adds corresponding unit test.
• This is a minor change.