audio: Load .WAV files with format->blockalign==0. In theory this is illegal, but legit wavefiles in the field do it, and it's easy to bump it to 1 for general purposes. Formats with more specific alignment requirements already check for them separately. Fixes #7714. (cherry picked from commit 2e646c7141b3009628abda2a964ba5f9d1702e1a)