fix: make roundstate enum names consistent

TournamentOrganizer/Models/Round.cs

@@ -18,7 +18,7 @@ public class Round
     [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
     public int Id { get; set; }
     public int MatchId { get; set; }
-    public RoundState State { get; set; } = RoundState.WAITING;
+    public RoundState State { get; set; } = RoundState.Waiting;
 
     public required List<PlayerParticipant> Players;
     public required Match Match { get; set; }