ConsistentProjectileHitbox

In 21w19a, projectile hitbox changes with its ages.
https://minecraft.wiki/w/Java_Edition_25w19a

It starts with 0 width, and it extends 0.05 each tick, until it reaches 0.3, which is original width.

This mod just simply, reverts that behavior to previous version with smol 1 mixin.
Projectile will have consistnet hitbox width(0.3) as soon as they spawn.