aplay: fix S24_LE wav header

alsa-project/alsa-utils pull request #260 was opened from psi-sue:

S24_LE is 32 bits in width storing 24 bits of data and 8 bytes of padding So wav header needs to be 32 bits not 24

Request URL : https://github.com/alsa-project/alsa-utils/pull/260 Patch URL : https://github.com/alsa-project/alsa-utils/pull/260.patch Repository URL: https://github.com/alsa-project/alsa-utils