Winners are not reloaded properly along with other challenge details!

[birdofpreyru]

If, without reloading the app, you go to details of one completed challenges, check the winners, and then go to another completed challenge details, you'll see that winners have not been reloaded properly. The reason is incorrect logic in related actions / reducers: they don't remember for which challenge the results have been loaded into redux state, and they don't reload results if they see that some results are loaded.