autoupdater: update download progress display less frequently #274
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Updating the "XXXXX / XXXXX KiB" display for every run of recv_image_cb() is a significant bottleneck on slow consoles. This was reported for a device using a 9600 Baud serial console, but the slowdown is noticeable even on a 115200 Baud console, especially when the network is fast.
Replace the output with a "XX.X / XX.X MiB" display and only update it every 0.1 MiB to fix the issue.
Closes #273