Dot11: fix type using {} instead of []

[gpotter2]

fixes #5070

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.59%. Comparing base (23f7000) to head (ddbe5e4).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5104      +/-   ##
==========================================
- Coverage   80.59%   80.59%   -0.01%     
==========================================
  Files         390      390              
  Lines       96884    96884              
==========================================
- Hits        78087    78084       -3     
- Misses      18797    18800       +3     

Files with missing lines	Coverage Δ
scapy/layers/dot11.py	92.30% <ø> (ø)

... and 12 files with indirect coverage changes

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