Fixed swapped fseek parameter order so that the WAV sizes get actually patched

Created originally on Bitbucket by jpaana (Jarno Paananen)

Was already merged in Bitbucket before import, marked as merged by the import user

Source changeset not longer availableat the time of import. Commit listwill look empty

Duh, for some reason programs didn't seem to care about the size values, but better to fix them anyway... Sorry!