Improve grep in ostree config-diff to not choke on spaces in filenames

roles/backup/templates/s3backup.sh

@@ -39,8 +39,7 @@ DIRS+=("{{ item }}")
 if command -v ostree > /dev/null 2>&1; then
 	for file in $(
 		ostree admin config-diff 2>/dev/null | \
-		grep -e '^[A|M]' | \
-		awk '{print $2}'
+		grep -oP '^[A|M]\s*\K.*'
 	); do
 		DIRS+=("/etc/$file")
 	done