rust: fix inherent to string

[TheKharleeci]

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Link to redmine ticket: https://redmine.openinfosecfoundation.org/issues/4618

This commit addresses rust "inherent_to_string" warnings.

Describe changes:

• ntlmssp_records:-Add fix to inherent_to_string warning
• Remove #!allow(clippy::inherent_to_string) clippy lint from rust/src/lib.rs

ticket: #4618

Previous PR: #6491

[jufajardini]

looks good to me :)

[jasonish]

looks good to me :)

Me to.

[victorjulien]

Same comment #6529 (comment) applies here.

[TheKharleeci]

Followed by: #6547