Bugfix tit.php

[seba1337]

Fixed a few bugs so it works with the latest PHP8.

[JMcrafter26]

Hi,
I used some of your code in my remade fork of this project (I mainly focused on design and ux features), if you want to check it out, here is the repo:
https://github.com/JMcrafter26/tiny-issue-tracker

Note: This is still in beta, but I managed to almost get it to release