fix: encode correct video width/height in transmuxed mp4

[brandonocasey]

See videojs/mux.js#393

[codecov]

Codecov Report

Merging #1166 (3c7bf27) into main (1d6bb55) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1166   +/-   ##
=======================================
  Coverage   86.45%   86.45%           
=======================================
  Files          39       39           
  Lines        9562     9562           
  Branches     2204     2204           
=======================================
  Hits         8267     8267           
  Misses       1295     1295           

Impacted Files	Coverage Δ
src/transmuxer-worker.js	74.35% <0.00%> (ø)

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