Standardise dynamic firewall log view

to be like Firewall Log widget:
1) Display IPv6 address and port in [a:b::c]:123 format
2) Fix same issue with rows gradually disappearing each update, or when in reverse order, update lines not being put in the right place.
3) Update the processing of function format_log_line(row) to reflect the changed list of data items returned by handle_ajax() in filter_log.inc