Ender 3 filament guide -- updated bolt pattern

I found borjang's original filament guide (linked below) had a bolt pattern distance of 17.9mm which did not fit my Ender well given the model's tight tolerances. This part expands the bolt pattern to the 19mm, which is the distance I measured on a newer Ender 3 (as of 12/5/2018). I also increased the tolerance around the lead screw guide by 0.5mm. The lead screw guide measures 10mm and the original part only allows for 10.5mm. There's no reason for tight tolerances here, so this makes it more f