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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

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

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