BF: In Py3, JSON calib files were not loaded into mon list

[dvbridges]

No description provided.

[codecov-io]

Codecov Report

Merging #1839 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1839      +/-   ##
==========================================
+ Coverage   46.73%   46.75%   +0.01%     
==========================================
  Files         221      221              
  Lines       33830    33832       +2     
  Branches     5674     5675       +1     
==========================================
+ Hits        15811    15818       +7     
+ Misses      16449    16447       -2     
+ Partials     1570     1567       -3

Impacted Files	Coverage Δ
psychopy/monitors/calibTools.py	39.44% <100%> (+0.21%)	⬆️
psychopy/data/base.py	72.76% <0%> (+0.89%)	⬆️
psychopy/visual/textbox/fontmanager.py	69.96% <0%> (+1.02%)	⬆️

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