Decode octal-escaped mountpoints and disown backgrounded restart

/proc/mounts uses octal escaping for special characters (e.g. \040 for
spaces). Decode with printf before passing to fusermount so paths with
spaces are handled correctly.

Add disown after backgrounding the gvfs restart so it survives
systemd-sleep's cgroup cleanup when the hook script exits.

default/systemd/system-sleep/unmount-fuse

@@ -8,6 +8,7 @@
 if [[ $1 == "pre" ]]; then
   while IFS=' ' read -r _ mountpoint fstype _; do
     if [[ $fstype == fuse.* ]]; then
+      mountpoint=$(printf '%b' "$mountpoint")
       fusermount3 -uz "$mountpoint" 2>/dev/null || fusermount -uz "$mountpoint" 2>/dev/null || true
     fi
   done < /proc/mounts
@@ -28,4 +29,5 @@ if [[ $1 == "post" ]]; then
       fi
     done
   ) &
+  disown
 fi