fix: broken whitespace guard in archive-images.sh

The case bracket expression [\ space\'\"] listed the letters s,p,a,c,e
as a character set instead of matching whitespace, rejecting every normal
path. Use the POSIX [[:space:]] class.

tools/archive-images.sh

@@ -20,7 +20,7 @@ patterns=("$@")
 
 for v in "$images_dir" "$archive_dir" "${patterns[@]}"; do
 	case $v in
-		*[\ space\'\"]*) die "unsafe argument (whitespace/quotes): $v" ;;
+		*[[:space:]\'\"]*) die "unsafe argument (whitespace/quotes): $v" ;;
 	esac
 done