When selecting prize, add winner to wine.

Changed the way we register a prize for winner.
Now we have a new prize_selected boolean field on a winner. This is
used to filter on when finding what winners have not selected a prize
yet. This also replaces the previous method of removing virtualWinners
after they selected a prize.

PrelotteryWine also get's a winner reference. This is used to filter on
when finding what prizes are left, and also makes it easier to
archive/register a lottery when the wine has a winner attached.

api/schemas/PreLotteryWine.js

@@ -9,7 +9,11 @@ const PreLotteryWine = new Schema({
   year: Number,
   image: String,
   price: String,
-  country: String
+  country: String,
+  winner: {
+    type: Schema.Types.ObjectId,
+    ref: "VirtualWinner"
+  }
 });
 
 module.exports = mongoose.model("PreLotteryWine", PreLotteryWine);

api/schemas/VirtualWinner.js

@@ -10,6 +10,10 @@ const VirtualWinner = new Schema({
   red: Number,
   yellow: Number,
   id: String,
+  prize_selected: {
+    type: Boolean,
+    default: false
+  },
   timestamp_drawn: Number,
   timestamp_sent: Number,
   timestamp_limit: Number