Fix typo in MapSecurityZone

[iSazonov]

PR Summary

Fix typo which comes from #11884 - "Internet" and "Intranet" names are too similar.
Discovered by @mklement0 #13869 (comment)

PR Context

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• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
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[iSazonov]

I could add xUnit tests for the code (in follow PR).

[mklement0]

I think test are definitely called for, given the potentially grave consequences of such a logic error.

[DEberhardt]

LGTM - Logic fix

[ghost]

🎉v7.1.0 has been released which incorporates this pull request.:tada:

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[prem874]

I think this is fine