Update zdo_converters.py

[pipiche38]

As discussed here zigpy/zigpy#865 (reply in thread), see the PR.

[codecov-commenter]

Codecov Report

Merging #123 (2881d4e) into dev (3fe9823) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #123   +/-   ##
=======================================
  Coverage   98.76%   98.76%           
=======================================
  Files          44       44           
  Lines        3882     3882           
=======================================
  Hits         3834     3834           
  Misses         48       48           

Impacted Files	Coverage Δ
zigpy_znp/zigbee/zdo_converters.py	100.00% <ø> (ø)

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