Prusa XL nozzle brush holder for longer brushes

This remix of @Surfalex2000's excellent work is compatible with longer brushes. It can be fixed to the printer using two M3x12 screws and another M3x12 screw can be used to adjust the height of the brush. Also check out https://www.printables.com/model/628210-xl-nozzle-scrubber-brush-nutless-twist-lock and https://www.printables.com/model/623520-prusa-xl-series-nozzle-brush-remix for alternative solutions!