packet detection fix - only high side of byte used

[compscidr]

Really minor - just fixing the debugged output

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.06%. Comparing base (6238840) to head (781995c).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main      #15   +/-   ##
=========================================
  Coverage     79.06%   79.06%           
  Complexity       85       85           
=========================================
  Files            18       18           
  Lines           511      511           
  Branches         63       63           
=========================================
  Hits            404      404           
  Misses           71       71           
  Partials         36       36           

Flag	Coverage Δ
libunittests	79.06% <100.00%> (ø)

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