tails-unblock-network calls undefined log function
If the blacklist couldn't be removed, it tries to call
log, which doesn't exist in POSIX shell. Of course there are very little chances that this happens given we
rm -f it just before, so I wonder if it's worth making this script any more complex by sourcing the relevant library file -- perhaps we could just drop the check.
Remove useless log() instance (Will-fix: #9034).
We haven't sourced the Tails shell library's loggin module, so log()
is undefined. Since we `rm -f` the file, log():ing if it still exists
afterwards should be pointless, so let's just not do it all.