table: Advertise local-pref set by import policy

At importing a path from an external peer, LOCAL_PREF can be set by an
import policy but at exporting a best path to an internal peer, this
learned, calculated LOCAL_PREF is never used and every time overwritten
by a default value 100.

According to RFC 4271 "5.1.5. LOCAL_PREF" and "9.1.1. Phase 1:
Calculation of Degree of Preference", the learned value should be
advertised to other internal peers.

This fixes it by just removing resetting a non-local path's LOCAL_PREF
by the default value.

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