sharpd: fix set ZAPI_MESSAGE_NEXTHOP in nhg only when nexthops used #16346
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The ZAPI_MESSAGE_NEXTHOP flag is systematically set, even if the route message does not include any nexthops. Limit the usage of this value only when nexthops are present.
Fixes: 8a71d93 ("sharpd: Add Super Happy Advanced Routing Protocol")