Bottom Reinforcement for Thinner Plastic for Prusa Protective Face Shield

This is a slightly modified version of the bottom reinforcement to have a tighter fit with thinner plastic. The original bottom reinforcement was too loose on the thinner plastic sheets I'm using: https://smile.amazon.com/gp/product/B0015ZVXIW/

The only modification is extending the buttons 0.5 mm to have a tighter grip on the plastic.