bgpd: fix the local-preference setting for EBGP-OAD

[enkechen-panw]

Make sure the local-preference is set for EBGP-OAD.

[greptile-apps]

Greptile Summary

This PR adds BGP_PEER_EBGP_OAD to the condition that determines when to set the local-preference attribute, treating EBGP-OAD peers similarly to IBGP and CONFED peers.

• EBGP-OAD (External BGP - Optimal Administrative Distance) peers represent a special peering type defined in draft-uttaro-idr-bgp-oad
• The change ensures that routes advertised to EBGP-OAD peers have the local-preference attribute set when it's not already present
• This is consistent with existing code patterns where EBGP-OAD peers are treated more like internal peers than external peers (see lines 2000, 2005, 2696, 3084-3085 in the same file)
• The fix aligns with path selection logic (lines 1486, 1501) where EBGP-OAD is grouped with IBGP/CONFED peers

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The change is a simple, focused fix that adds EBGP-OAD to an existing condition. It's consistent with multiple other locations in the codebase where EBGP-OAD peers are treated like IBGP/CONFED peers rather than standard EBGP peers. The pattern matches the established architecture for handling this peer type.
• No files require special attention

Important Files Changed

Filename	Overview
bgpd/bgp_route.c	Added BGP_PEER_EBGP_OAD to the condition for setting local-preference, treating EBGP-OAD peers like IBGP/CONFED peers

_{Last reviewed commit: 7f73de9}

[riw777]

looks good