Werk #14438: fritz_wan_if: Fix interface status for non DSL devices

Component	Checks & agents
Title	fritz_wan_if: Fix interface status for non DSL devices
Date	Jun 22, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Modern Fritz boxes (non DSL) don't use or don't have the "NewLinkStatus" value. Instead we use "NewPhysicalLinkStatus" for those.

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