Further Fixed K-98

This is a mod built off of antman311's "Fixed Kar98K" mod Antman311 did an excellent job fixing the rear sight tab, but I also spotted another issue on the original textures that needed fixing: the Flathead screw and the groove on the end of the bolt!!!! I own a 98K and it's sitting right by me now and I can assure you that there wasn't a screw there...so I fixed it.