vars: remove duplicate host_id

initial-setup.sh

@@ -90,7 +90,6 @@ export HOSTNAME=$(hostname)
 export BORG_REPO=${BORG_REPO}
 export BORG_HOST_ID=${HOSTID}
 export BORG_PASSCOMMAND="cat ${BORG_DIR}/passphrase"
-export BORG_HOST_ID=${HOSTID}
 export BORG_DIR=${BORG_DIR}
 export SSH=${SSH}
 export BORG=${BORG}