Rooting htc one for noob

[AC Question]

Ok so I rooted my htc one m8 and installed cyanogen 13 with twrp. Everything worked fine. But I woke up and checked if my phone was still rooted and it wasn't. But I still have supersU and when I try open super su. It says there is no su Binery and I can't find where to install it. My boot loader is still unlocked. What I want to do is un root and re root. I'm pretty sure cyanogen 13 doesn't need root acces to run. Because if it did my phone wouldn't be working right now