use compatibility command

[AlexStorm1313]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Changes iptables command to iptables-nft to use new nftables backend. This might need some more work to incorporate a setting for which back-end to use. This PR is just a start for making nftables work as a backend for now.

Benefits of this PR and context:

Fixes #380

How Has This Been Tested?

Tested using Fedora 42

Source / References:

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[LinuxServer-CI]

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[imjuzcy]

Tested on Fedora Server 42 and Ubuntu Server 24.10, no issue found so far

[LinuxServer-CI]

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[LinuxServer-CI]

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