[FIX] packaging: stop removing Odoo lib dir

When removing Odoo Debian package, the directory /var/lib/odoo is also
removed. This directory could contain important data like filestore or
custom modules.

With this commit, this directory is preserved on removal and deleted
when the purge command is issued with a Debian package manager.

Fixes odoo#22138

Author: d-fence

debian/postrm

@@ -10,9 +10,6 @@ case "${1}" in
     remove)
         deluser --quiet --system $ODOO_USER || true
         delgroup --quiet --system --only-if-empty $ODOO_GROUP || true
-        if [ -d "$ODOO_LIB_DIR" ]; then
-            rm -rf $ODOO_LIB_DIR
-        fi
         ;;
 
     purge)