graph: rename HasLightningNode

to HasNode

graph/db/sql_store.go

@@ -283,14 +283,14 @@ func (s *SQLStore) FetchNode(ctx context.Context,
 	return node, nil
 }
 
-// HasLightningNode determines if the graph has a vertex identified by the
+// HasNode determines if the graph has a vertex identified by the
 // target node identity public key. If the node exists in the database, a
 // timestamp of when the data for the node was lasted updated is returned along
 // with a true boolean. Otherwise, an empty time.Time is returned with a false
 // boolean.
 //
 // NOTE: part of the V1Store interface.
-func (s *SQLStore) HasLightningNode(ctx context.Context,
+func (s *SQLStore) HasNode(ctx context.Context,
 	pubKey [33]byte) (time.Time, bool, error) {
 
 	var (