app-layer: fix integer warnings

[catenacyber]

Link to redmine ticket:
https://redmine.openinfosecfoundation.org/issues/4516

Describe changes:

• Avoids some warnings about integers : for direction argument of StreamTcpUpdateAppLayerProgress

DRAFT : do not merge

@victorjulien you said :

I would like this to be solved in a different way, more like how its now done on the Rust side: with a direction enum

But C enums are not as good as Rust enums.
So, I am not sure this is a good idea.

For instance, keeping direction = 1 - direction; in this patch (with direction being an enum Direction) does not produce warnings on my setup !

See commit 53aac7f for the alternative

[suricata-qa]

ERROR: QA failed on report_failure.

ERROR: QA failed on tlpr1_autofp_suri.

Pipeline 5071

[catenacyber]

See #7006