Fix bugged Device constructor

[rly]

Fix #1208

[codecov]

Codecov Report

Merging #1209 into dev will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev    #1209      +/-   ##
==========================================
+ Coverage   67.97%   68.01%   +0.04%     
==========================================
  Files          37       37              
  Lines        2398     2401       +3     
  Branches      423      423              
==========================================
+ Hits         1630     1633       +3     
  Misses        697      697              
  Partials       71       71              

Impacted Files	Coverage Δ
src/pynwb/device.py	100.00% <100.00%> (ø)

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