keep the devPath used on serial connections

[mkinney]

No description provided.

[codecov]

Codecov Report

Merging #276 (f674afc) into master (db90b89) will increase coverage by 0.00%.
The diff coverage is 83.33%.

@@           Coverage Diff           @@
##           master     #276   +/-   ##
=======================================
  Coverage   89.09%   89.10%           
=======================================
  Files          13       13           
  Lines        2045     2046    +1     
=======================================
+ Hits         1822     1823    +1     
  Misses        223      223           

Flag	Coverage Δ
unittests	89.10% <83.33%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
meshtastic/serial_interface.py	97.72% <83.33%> (+0.05%)	⬆️

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