[WifiTrackerLib] Ignore broadcast passpoint wificonfig in Saved Networks

Ignore WifiConfigurations for passpoint that are broadcasted through
CONFIGURED_NETWORKS_CHANGED in the Saved Networks Page, since this will
be mistakenly interpreted as an added saved network.

Bug: 158043510
Test: manual visual verification of Saved Networks Page not showing the
broadcasted passpoint wificonfig as a saved network.

Change-Id: Icfd746c86bee3c7b06252f79977e5ba87ea30b6e
2 files changed