zebra: fix nht validity checking to be same as when it's resolved

This reverts commit 7e3a435bd99 "A valid BGP nexthop is flagged as invalid"

Problem is BGP thinks the nexthop is accessible when it's recursive, and
selects it, but zebra rejects it at route install time. Causing FIB and
BGP state to be out-of-sync. Fix nht to follow same rules as zebra rib.
1 file changed