tests: add ndb support to tests

stops it from crashing

damus/Views/ReactionsView.swift

@@ -37,7 +37,7 @@ struct ReactionsView: View {
 
 struct ReactionsView_Previews: PreviewProvider {
     static var previews: some View {
-        let state = test_damus_state()
+        let state = test_damus_state
         ReactionsView(damus_state: state, model: ReactionsModel(state: state, target: test_note.id))
     }
 }