[transparent-proxy] remove redundant TCP DNS port matchers from iptables rules

[bartsmykla]

Description

Follow-up to: #14557

After that change, TCP packets on DNS port 53 are no longer redirected, but some rules still include redundant ! --dport 53 matchers. These can be safely removed to simplify the ruleset.

For example, this rule:

-A KUMA_MESH_OUTBOUND -p tcp ! --dport 53 -o eth0 -m owner ! --uid-owner 0 -j RETURN

can now be reduced to:

-A KUMA_MESH_OUTBOUND -p tcp -o eth0 -m owner ! --uid-owner 0 -j RETURN

Cleaning up these unnecessary TCP DNS port matchers will make the rules clearer and easier to maintain.