BF: mic.bank values from Builder

[TEParsons]

1. Accept 'None' as a synonym for False when mic.bank is called
2. Don't try to unpack values from mic.bank in Builder when transcription is disabled

[codecov]

Codecov Report

Merging #4163 (afc009f) into release (fc8415e) will increase coverage by 0.00%.
The diff coverage is 33.33%.

@@           Coverage Diff            @@
##           release    #4163   +/-   ##
========================================
  Coverage    35.67%   35.68%           
========================================
  Files          288      288           
  Lines        56764    56770    +6     
  Branches      9674     9676    +2     
========================================
+ Hits         20251    20257    +6     
+ Misses       34536    34534    -2     
- Partials      1977     1979    +2     

Impacted Files	Coverage Δ
psychopy/sound/microphone.py	28.95% <0.00%> (-0.20%)	⬇️
...chopy/experiment/components/microphone/__init__.py	82.64% <50.00%> (-0.61%)	⬇️
psychopy/visual/movie3.py	61.71% <0.00%> (+1.48%)	⬆️

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