command/file: "albumart" tries to send larger chunks if available
If we only receive very little data from the InputStream, try a second Read() call to get more data. This works around tiny reads at input buffer boundaries with the io_uring input plugin. These tiny reads are inefficient, and we can afford to wait one more low-level I/O iteration to finish (but not more). Closes https://github.com/MusicPlayerDaemon/MPD/issues/2186
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