Fix dolphin places config (user-places.xbel)

Existing dolphin configs can be incorrect for two reasons:
- Instead of the class identifier, a * was incorrectly entered in the home@server URL.
- If the student has changed classes, the old class name is still in the home URL.

lmn-patch-dolphin.sh no longer enters a * in the home@server URL.
lmn-fixhome-dolphin.sh will fix existing configs.

roles/lmn_fvs/files/lmn-patch-dolphin.sh

@@ -16,11 +16,12 @@ fi
 id="$(grep ID "$file" | sed -E "s|^.+ID>([[:digit:]]+)/([[:digit:]]+)</ID.+$|\1:\2|" \
 	    | sort -n -t: -k2 | tail -1 )"
 
-if id | grep teachers; then
+if id | grep -q teachers; then
   NETHOME=/srv/samba/schools/default-school/teachers/$USER
 else
-  NETHOME=/srv/samba/schools/default-school/students/*/$USER
+  NETHOME=(/srv/samba/schools/default-school/students/*/"$USER")
 fi
+[[ -d $NETHOME ]] || exit 0
 
 IDENTITY="${id%%:*}"
 NUM0="${id##*:}"