Steam Deck Repair Jig Fixed

Remix of ryohazuki224's Steam Deck Repair Jig due to several inconsistencies with the dimensions of the actual Steam Deck. This remix now fits the Steam Deck properly and serves as a stable platform for servicing it.

Alterations are as follows:

• Widened by 5mm by expanding screen area, 2.5mm per side
• Widened top of menu button holes up 1mm
• Moved touchpad holes down 2mm
• Moved system button holes down 3mm
• Moved speaker holes down 4mm
• Stretched bottom edge down 4mm
• Smoothed grip areas to remove non-existent ridge
• Leveled side edges
• Fixed mesh issues caused by making the above alterations

Only made these alterations on the two halves, because I couldn't be bothered to do it all again on the single-piece model as it doesn't fit on my printer. Also, breaking it into two pieces is great for storing it.