Update prusa-slicer.md

Author: ivan-hc

apps/prusa-slicer.md

@@ -4,7 +4,7 @@
 
  SITE: https://www.prusa3d.com 
 
- SOURCE: https://github.com/prusa3d/PrusaSlicer
+ SOURCE: https://github.com/probonopd/PrusaSlicer
 
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