store: use db iterators for pruning and range-based queries (#5848)

statesync/stateprovider.go

@@ -72,7 +72,7 @@ func NewLightClientStateProvider(
 	}
 
 	lc, err := light.NewClient(ctx, chainID, trustOptions, providers[0], providers[1:],
-		lightdb.New(dbm.NewMemDB(), ""), light.Logger(logger), light.MaxRetryAttempts(5))
+		lightdb.New(dbm.NewMemDB()), light.Logger(logger), light.MaxRetryAttempts(5))
 	if err != nil {
 		return nil, err
 	}