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Until now, the function would always pass `true` as the "progress"
parameter to aw_write_buffer(). This has the potential drawback
of limiting the maximum USB transfer size.

By selectively passing `false` instead (with no progress function
active), we hint that aw_write_buffer() and subsequent routines
don't have to care about callbacks; so that usb_bulk_send() is
free to select a transfer size of AW_USB_MAX_BULK_SEND.
Reviewed-by: Bernhard Nortmann <bernhard.nortmann@web.de>