Update 02-fix-perms.sh for rrd folder

Since Librenms 23.10.0 each poller needs to create a folder in /rrd. See librenms/librenms#15457.
Without this permission the eventlog creates message "Failed to create rrd directory: /opt/librenms/rrd/x.x.x.x/" with every device poll.

Author: bonzo81

rootfs/etc/cont-init.d/02-fix-perms.sh

@@ -10,7 +10,8 @@ chown librenms:librenms \
   /data \
   "${LIBRENMS_PATH}" \
   "${LIBRENMS_PATH}/.env" \
-  "${LIBRENMS_PATH}/cache"
+  "${LIBRENMS_PATH}/cache" \
+  "${LIBRENMS_PATH}/rrd"
 chown -R librenms:librenms \
   /home/librenms \
   /tpls \