avoid ConcurrentModificationException-esque error by saving directory names beforehand

scripts/postTreatmentAudible.sh

@@ -2,7 +2,11 @@
 set -euo pipefail
 
 /sync/scripts/escapeFilenames.sh . _
+declare -a dirs=();
 for d in *; do
+   dirs+=($d);
+done
+for d in "${dirs[@]}"; do
    cd "$d";
    /sync/scripts/escapeFilenames.sh Chapter Kapitel
    /sync/scripts/reencode_m4a.sh -map;