[3dprinter-general] slic3r-prusa is marked for autoremoval from testing

[Gregor Riepl]

> It is affected by these RC bugs:
> 1054697: slic3r-prusa: FTBFS: test_arrange.cpp:1:10: fatal error: catch2/catch.hpp: No such file or directory
>   https://bugs.debian.org/1054697

This bug was fixed by the last upload, but builds still failed due to a 
different issue:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1056897

I've submitted a patch, please test and upload when you can.
Thanks!