Update Citrix _os.py for correct timezone detection

[RGlintmeijer]

Fix a crash when fetching the timezone of the netscaler when it has a configline like 'set ns param -cookieversion 1 -timezone "GMT+02:00-CEST-Europe/Amsterdam"'.

Traceback (most recent call last):
  File "/root/citrix-netscaler-triage/iocitrix.py", line 267, in <module>
    main()
  File "/root/citrix-netscaler-triage/iocitrix.py", line 263, in main
    check_targets(args.targets)
  File "/root/citrix-netscaler-triage/iocitrix.py", line 228, in check_targets
    print_target_info(target)
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/tools/info.py", line 133, in print_target_info
    print(f"Timezone      : {target.timezone}")
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/target.py", line 622, in __getattr__
    result = func.__get__(p)
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/helpers/cache.py", line 228, in cache_wrapper
    return cache.call(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/helpers/cache.py", line 104, in call
    func_cache[key] = self.func(*args, **kwargs)
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/plugins/os/unix/locale.py", line 35, in timezone
    zoneinfo_path = str(zoneinfo.readlink()).split("/")
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/helpers/fsutil.py", line 747, in readlink
    path = self._accessor.readlink(self)
  File "/usr/local/lib/python3.9/dist-packages/dissect/target/helpers/fsutil.py", line 528, in readlink
    raise e
OSError: 22

[codecov]

Codecov Report

Merging #363 (734402e) into main (1f58694) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #363   +/-   ##
=======================================
  Coverage   71.75%   71.75%           
=======================================
  Files         238      238           
  Lines       18684    18684           
=======================================
  Hits        13406    13406           
  Misses       5278     5278           

Flag	Coverage Δ
unittests	71.75% <ø> (ø)

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Files Changed	Coverage Δ
dissect/target/plugins/os/unix/bsd/citrix/_os.py	97.84% <ø> (ø)

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