Should not be able to add cards to multiple piles

[LukeHowellDev]

Currently, you can add a card to multiple piles. This should not be allowed. This can be replicated like the following:

1. Create new deck
2. Draw a number of cards from the deck
3. Add a card to pile1
4. Add the same card to pile2

You will see the card in both piles using `api/deck/<<deck_id>>/pile/<<pile_name>>/list

[piavgh]

Hi @LukeHowellDev ,

I noticed this issue too. Do you have a plan to work on it?
Thank you.

[crobertsbmw]

I'll check it out today. Thanks for the reminder.

[LukeHowellDev]

@piavgh I got sidetracked on this and did not work on this.

[crobertsbmw]

Fixed.