src: remove unused struct fields

[catenacyber]

Link to ticket: https://redmine.openinfosecfoundation.org/issues/
None, just a simple cleanup

Describe changes:

• src: remove unused struct fields

What about counter_tcp_pseudo_failed ?

[victorjulien]

What about counter_tcp_pseudo_failed ?

Never incremented it seems, so it can be removed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@            Coverage Diff            @@
##             master   #12299   +/-   ##
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  Coverage          ?   83.24%           
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  Files             ?      912           
  Lines             ?   257622           
  Branches          ?        0           
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  Hits              ?   214462           
  Misses            ?    43160           
  Partials          ?        0           

Flag	Coverage Δ
fuzzcorpus	61.09% <ø> (?)
livemode	19.39% <ø> (?)
pcap	44.44% <ø> (?)
suricata-verify	62.85% <ø> (?)
unittests	59.18% <ø> (?)

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[suricata-qa]

Information: QA ran without warnings.

Pipeline 23983