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Fix duplicate comment in iptables rule for non-local public-port rule

**What this PR does / why we need it**:

When kubernetes creates an iptable rule for "from-non-local public-port"
rule the rule gets created with two identical comment section.

The function `iptablesNonLocalNodePortArgs` creates a list of arguments
for the rule from iptablesCommonPortalArgs function. This function
already appends the arguments for the rules comments and therefore does
not require appending the comment again.

**Special notes for your reviewer**:

I'm actually not a go programmer at all and have no idea how your tests work.
I doubt that my fix will require adjustements on tests but I'm not 100% sure.
If additional work is needed, I would be glad if someone could point it out to me so I can take care of it.

**Release note**:
```release-note
NONE
```