Better Backplate and Trigger for Powkiddy RGB20SX

My design of a better backplate and trigger for the RGB20SX.
Removed ski-slope for better pocket ability.
lower profile trigger for ease when sliding in and out of pocket.
Added DMG style texture for grip.
Added an indentation for your Gameboy sticker.
Test printed using PLA (Bambu Lab) and SLA (Formlabs) machines