Remove Bullet Level Requirements

So, bullets are heavily tiered from the very start, meaning even basic upgrades like 21 attack bullets requires level 50, like these https://uploads.playkuro.com/forum/images/1784393882950-1c32741e302a4448.png While on the flip side, arrows such as these have 0 level requirement, and there are even better options https://uploads.playkuro.com/forum/images/1784393937138-5c9736837be31493.png and of course, there's stuff like Ilbis that also only require level 10.