Ignore critical layers from filter()

[gpotter2]

fixes #4722

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.16%. Comparing base (15c632d) to head (97b02f8).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4755   +/-   ##
=======================================
  Coverage   82.16%   82.16%           
=======================================
  Files         362      362           
  Lines       87345    87347    +2     
=======================================
+ Hits        71763    71767    +4     
+ Misses      15582    15580    -2     

Files with missing lines	Coverage Δ
scapy/config.py	80.70% <100.00%> (+0.21%)	⬆️

... and 6 files with indirect coverage changes

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