Fix failregex for fail2ban config

[Tobi823]

The user name is no longer surrounded by "

It seems that the log format for failed login attempts has changed. For example:

Oct 03 17:41:05 manjaro-server docker_jellyfin[461]: [16:41:05] [INF] [79] Jellyfin.Server.Implementations.Users.UserManager: Authentication request for arsasrtarstartarstars has been denied (IP: 172.16.53.2).

The user name is no longer surrounded by a quotation marks.

[Tobi823]

My changes seem to work

fail2ban-regex -m SYSLOG_IDENTIFIER=docker_jellyfin systemd-journal /etc/fail2ban/filter.d/jellyfin.conf

Running tests
=============

Use   failregex filter file : jellyfin, basedir: /etc/fail2ban
Use         systemd journal
Use         encoding : UTF-8
Use    journal match : SYSLOG_IDENTIFIER=docker_jellyfin


Results
=======

Failregex: 32 total
|-  #) [# of hits] regular expression
|   1) [32] ^.*Authentication request for .* has been denied \(IP: <ADDR>\)\.
`-

Ignoreregex: 0 total

Lines: 26392 lines, 0 ignored, 32 matched, 26360 missed
[processed in 2.46 sec]

Missed line(s): too many to print.  Use --print-all-missed to print all 26360 lines