Revert "chainntnfs/bitcoindnotify: disable height hints in testing"

This reverts commit ab28db5b0d.

chainntnfs/bitcoindnotify/bitcoind_test.go

@@ -25,7 +25,7 @@ func initHintCache(t *testing.T) *chainntnfs.HeightHintCache {
 	if err != nil {
 		t.Fatalf("unable to create db: %v", err)
 	}
-	hintCache, err := chainntnfs.NewHeightHintCache(db, true)
+	hintCache, err := chainntnfs.NewHeightHintCache(db)
 	if err != nil {
 		t.Fatalf("unable to create hint cache: %v", err)
 	}