Remove temporary files on update.

selfupdate/update_header.sh

@@ -4,3 +4,4 @@ rm -rf /root/stratux-update
 mkdir -p /root/stratux-update
 cd /root/stratux-update
 mv -f /var/log/stratux.sqlite /var/log/stratux.sqlite.`date +%s`
+rm -f /var/log/stratux.sqlite-wal /var/log/stratux.sqlite-shm