LL_VERSION_IND Subversion field should be little-endian

[XenoKovah]

The Subversion field of LL_VERSION_IND is little-endian (like most other fields). However currently it's being parsed as big-endian. This change fixes the definition to be little-endian.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (c15a670) to head (b3122bf).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4662      +/-   ##
==========================================
- Coverage   81.55%   78.56%   -3.00%     
==========================================
  Files         359      334      -25     
  Lines       86557    81357    -5200     
==========================================
- Hits        70592    63918    -6674     
- Misses      15965    17439    +1474     

Files with missing lines	Coverage Δ
scapy/layers/bluetooth4LE.py	96.86% <ø> (-0.01%)	⬇️

... and 286 files with indirect coverage changes

[guedou]

Thanks for the PR!

[gpotter2]

Thanks for the PR & sorry for the delay.
It's nicer to have unit tests when fixing bugs, although for the size of this one it's alright.