chainntnfs/interface_test: run tests w/ disabled cache

chainntnfs/interface_test.go

@@ -1572,7 +1572,7 @@ func TestInterfaces(t *testing.T) {
 		if err != nil {
 			t.Fatalf("unable to create db: %v", err)
 		}
-		hintCache, err := chainntnfs.NewHeightHintCache(db)
+		hintCache, err := chainntnfs.NewHeightHintCache(db, true)
 		if err != nil {
 			t.Fatalf("unable to create height hint cache: %v", err)
 		}