Fix nurse shark and remove mid-battle choice.

internal/server/ws.go

@@ -32,7 +32,6 @@ type clientMessage struct {
 	Difficulty string   `json:"difficulty"` // addBot
 	Target     string   `json:"target"`     // removePlayer (player ID)
 	Card       string   `json:"card"`       // revealChoose (Cockatoo): pet card id
-	Value      int      `json:"value"`      // battleChoose (Nurse Shark): Trumpets to spend
 }
 
 type serverMessage struct {
@@ -152,8 +151,6 @@ func (s *Server) apply(r *room, c *client, msg clientMessage) {
 		err = g.TradeChoose(c.playerID, msg.Pick)
 	case "revealChoose":
 		err = g.RevealChoose(c.playerID, msg.Card)
-	case "battleChoose":
-		err = g.BattleChoose(c.playerID, msg.Value)
 	case "pass":
 		err = g.Pass(c.playerID)
 	case "arrange":