Fix send_command in BluetoothUserSocket

[gpotter2]

fixes #4741

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 82.16%. Comparing base (15c632d) to head (6e26188).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/bluetooth.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4754   +/-   ##
=======================================
  Coverage   82.16%   82.16%           
=======================================
  Files         362      362           
  Lines       87345    87345           
=======================================
+ Hits        71763    71766    +3     
+ Misses      15582    15579    -3     

Files with missing lines	Coverage Δ
scapy/layers/bluetooth.py	90.50% <0.00%> (ø)

... and 2 files with indirect coverage changes

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