flash_swagbadge.sh only generate keys when not found. #48
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If configuration/keys.db has a non zero key then don't attempt to
generate a new one. This means users can use mpfshell to read the
key and network settings, add them to configuration/keys.db and
configuration/net.py and use this script to update there 2021
badge.
I'm open to other approaches to pass through the key but this
seamed the simplest.