Add fix that strips unexpected padding for NV12 frames

[hexbabe]

On macOS Sonoma, using the Logitech C922 Pro webcam, NV12 frames seem to come with a default min amount of padding for smaller resolutions e.g. 160x90. This would result in smaller resolution NV12 images outputting like this:

my upside down forehead

This change crops the data—making sure it is packed tightly—so that the decodeNV12 precondition can be preserved.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.63%. Comparing base (68df5b3) to head (7bc72ac).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #556   +/-   ##
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  Coverage   58.63%   58.63%           
=======================================
  Files          63       63           
  Lines        3885     3885           
=======================================
  Hits         2278     2278           
  Misses       1473     1473           
  Partials      134      134           

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[edaniels]

LGTM. Thanks for this fix!