fix(userspace/libsinsp): properly inherit rawarg PT_DYN print format.

[FedeDP]

What type of PR is this?

/kind bug

Any specific area of the project related to this PR?

/area libsinsp

What this PR does / why we need it:

Fixes an issue preventing the print of rawarg.
Before:

sudo ./libsinsp/examples/sinsp-example -m -f "evt.type=setuid and evt.dir=>" -o "arg=%evt.rawarg.uid"
-- Filter AST (2) ppm sc names: setuid, setuid32
-- Try to open: 'modern_bpf' engine.
-- Engine 'modern_bpf' correctly opened.
-- Start capture
arg=
arg=
arg=

Because print_format is PF_NA.

After:

sudo ./libsinsp/examples/sinsp-example -m -f "evt.type=setuid and evt.dir=>" -o "arg=%evt.rawarg.uid"
-- Filter AST (2) ppm sc names: setuid, setuid32
-- Try to open: 'modern_bpf' engine.
-- Engine 'modern_bpf' correctly opened.
-- Start capture
arg=0
arg=1000
arg=1000

and print format is correctly set to PF_DEC.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

fix(userspace/libsinsp): properly inherit rawarg PT_DYN print format.

[FedeDP]

/milestone 0.14.0

[FedeDP]

/cc @jasondellaluce @mstemm

[incertum]

Nice!

/approve

[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Andreagit97, FedeDP, incertum

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[FedeDP]

/milestone 0.13.3