Python3 fixes for the shot_detect example

[ssteinbach]

The python bytes vs str issue is present in the shot_detect.py example. This should fix that and make it usable again.

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: ssteinbach / name: Stephan Steinbach (b1760a7010fe0d7bd723c2d49c6f4bcb15ff0d8e)

[codecov-commenter]

Codecov Report

Merging #1374 (9ec742a) into main (6cd4161) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1374   +/-   ##
=======================================
  Coverage   86.27%   86.27%           
=======================================
  Files         196      196           
  Lines       19865    19865           
  Branches     2309     2309           
=======================================
  Hits        17138    17138           
  Misses       2161     2161           
  Partials      566      566           

Flag	Coverage Δ
py-unittests	86.27% <ø> (ø)

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