fix typo in error string
fix typo in error string

erdgeist/letsencrypt.sh,ahnooie/dehydrated,erorus/letsencrypt.sh,Rayne/letsencrypt.sh,dennisschuerholz/dehydrated,erdgeist/letsencrypt.sh,lukas2511/dehydrated,Vitexus/dehydrated,lukas2511/letsencrypt.sh