graph/db: fetch policy version in cache paginated query

The ListChannelsWithPoliciesForCachePaginated query was missing the
policy version column, causing extractChannelPolicies to hardcode
lnwire.GossipVersion1 for that row type. Add cp1.version and
cp2.version to the query and use the fetched values instead.

graph/db/sql_store.go

@@ -5082,7 +5082,7 @@ func extractChannelPolicies(row any) (*sqlc.GraphChannelPolicy,
 	case sqlc.ListChannelsWithPoliciesForCachePaginatedRow:
 		if r.Policy1Timelock.Valid {
 			policy1 = &sqlc.GraphChannelPolicy{
-				Version:                 int16(lnwire.GossipVersion1),
+				Version:                 r.Policy1Version.Int16,
 				Timelock:                r.Policy1Timelock.Int32,
 				FeePpm:                  r.Policy1FeePpm.Int64,
 				BaseFeeMsat:             r.Policy1BaseFeeMsat.Int64,
@@ -5099,7 +5099,7 @@ func extractChannelPolicies(row any) (*sqlc.GraphChannelPolicy,
 		}
 		if r.Policy2Timelock.Valid {
 			policy2 = &sqlc.GraphChannelPolicy{
-				Version:                 int16(lnwire.GossipVersion1),
+				Version:                 r.Policy2Version.Int16,
 				Timelock:                r.Policy2Timelock.Int32,
 				FeePpm:                  r.Policy2FeePpm.Int64,
 				BaseFeeMsat:             r.Policy2BaseFeeMsat.Int64,