Improved LED Support Bracket

When Printer box released a beta version of their filament holder I attempted to install it on my box but the screws weren't long enough due to the fact that both the corner stands and the LED mounting brackets add a lot of space making it so the screw can barely grasp the hex nut.  I was able to use the STEP file provided to deepen the recess for the hex but in the LED bracket from 5mm to 2mm. The added benefit is that the hex nut fits in more snuggly.

Based off files found at https://www.printer-box.com/download/#elf_l1_UHJ1c2EtYm94