fix: restore foris config from snapshots

Hotfixes https://gitlab.nic.cz/turris/turris-os-packages/-/issues/657

updater/fix/files/config-foris-restore

@@ -4,12 +4,12 @@ set -eu
 config="/etc/config/foris"
 
 if [ ! -s "$config" ]; then
-	schnapps list | awk 'NR > 2 { print $1 }' | sort -rn | \
-		while read -r snapshot; do
+	schnapps list | awk 'NR > 2 { print $1 }' | sort -rn \
+		| while read -r snapshot; do
 			schnapps mount "$snapshot" >/dev/null
 			mntp="/mnt/snapshot-@$snapshot"
-			if [ -s "$mntp$config" ]; then
-				cp -a "$mntp$config" "$config"
+			if [ -s "${mntp}${config}" ]; then
+				cp -a "${mntp}${config}" "$config"
 				umount "$mntp"
 				exit 0
 			fi