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-fixhome-dolphin.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/bash
+
+set -eu
+
+file="${1:-$HOME/.local/share/user-places.xbel}"
+
+[[ -e "$file" ]] || exit 0
+
+if id | grep -q teachers; then 
+  exit 0
+fi
+
+NETHOME=(/srv/samba/schools/default-school/students/*/"$USER")
+[[ -d $NETHOME ]] || exit 0
+
+if FOUND=$(grep -o "/srv/samba/schools/default-school/students/.*/$USER" $file); then
+  if [[ "$NETHOME" != "$FOUND" ]] ; then
+    sed -i "s|/srv/samba/schools/default-school/students/.*/$USER|$NETHOME|g" $file
+  fi
+fi