Update for PrusaSlicer

[peter-holdsworth]

I don't know how to fork these things - but as an FYI - this works with PrusaSlicer 2.4 (running a 64bit Rasberry Ubuntu)

Had to update line 284 to:
args = ['"%s"' % executable, '--load', '"%s"' % profile_path, '--center', '"%f,%f"' % (posX, posY), '-o', '"%s"' % machinecode_path, '"%s"' ,'-g ', % model_path]

[sphereinabox]

Looks like the check for PrusaSlicer doesn't work with 2.4. See

OctoPrint-Slic3r/octoprint_slic3r/__init__.py

Line 293 in b21c2aa

if help_text.startswith(b'PrusaSlicer-2.3'):