typo: [vidstabdetect @ 0x7fff32d00b68] Multitheading: use 3 threads

[Wikinaut]

s/theading/threading/

in ffmpeg version 4.2.7-0ubuntu0.1 (I could not find it here in the repo, sorry).

[thinrope]

Not sure where does this come from, but there are 2 related typos, mentioning "theads": https://github.com/georgmartius/vid.stab/blob/master/tests/test_omp.c#L9 https://github.com/georgmartius/vid.stab/blob/master/tests/test_omp.c#L22