Bugfix#4556- Fix enum mismatch by changing keys to bytes in dict

[satveerbrar]

fixes #4556

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.70%. Comparing base (a8583a5) to head (00f9b5e).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4609      +/-   ##
==========================================
- Coverage   81.38%   78.70%   -2.69%     
==========================================
  Files         359      334      -25     
  Lines       86029    80830    -5199     
==========================================
- Hits        70017    63618    -6399     
- Misses      16012    17212    +1200     

Files with missing lines	Coverage Δ
scapy/layers/ntp.py	85.28% <ø> (-0.04%)	⬇️

... and 286 files with indirect coverage changes

[gpotter2]

Thanks for the PR !