RDKCOM-5180 RDKBDEV-3025: WanManager trying to get default route for erouter0 main routing table

[VyacheslavSalnikov]

RDKBDEV-3025: WanManager trying to get default route for erouter0 main routing table

Reason for change: WanManager trying to get default route from the default routing table instead of erouter routring table where default route added.
Test Procedure: Read wanmanager log

Risks: Low
Priority: P4

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