Improve the way of generating Egyptian National Ids

[ahmedghanem00]

What is the reason for this PR?

• [ ] A new feature
• [x] Fixed an issue (resolve #ID)

Author's checklist

• [ ] Follow the Contribution Guide
• [ ] New features and changes are documented

Summary of changes

As the old way of generating national-ids wasn't accurate. This change should fix that

Review checklist

• [ ] All checks have passed
• [ ] Changes are approved by maintainer

[ahmedghanem00]

I totally forgot about the unit test file 😅. I've run PHP-cs-fixer on that file as well, and hopefully no tests will fail.

[pimjansen]

Looks good thanks!