scripts: cron use rwm from PATH

scripts/cron.sh

@@ -6,7 +6,7 @@ umask 077
 LOGFILE="/var/log/rwm/cron.log.$(date +'%Y-%m-%dT%H:%M:%S%z')"
 mkdir -p "$(dirname "$LOGFILE")"
 
-/opt/rwm/rwm.py --config /etc/rwm.conf backup-all 1>"$LOGFILE" 2>&1
+rwm --config /etc/rwm.conf backup-all 1>"$LOGFILE" 2>&1
 RET=$?
 
 if [ $RET = 0 ]; then
@@ -19,4 +19,4 @@ cat "$LOGFILE" | mail -E -s "rwm backup-all $RESULT" "$LOGNAME"
 
 find /var/log/rwm -type f -mtime +90 -exec rm {} \;
 
-exit $RET
\ No newline at end of file
+exit $RET