🐛 Replace Equals with SequenceEqual

still not foolproof, since Die and Face don't redefine equals etc.

the reason why all the tests pass is because we don't have UTs for DiceGroupManager

Sources/Model/Dice/DiceGroupManager.cs

@@ -69,7 +69,7 @@ namespace Model.Dice
         public Task<DiceGroup> Update(DiceGroup before, DiceGroup after)
         {
             // pas autorisé de changer les dés, juste le nom
-            if (!before.Dice.Equals(after.Dice))
+            if (!before.Dice.SequenceEqual(after.Dice))
             {
                 throw new ArgumentException("the group of dice cannot be updated, only the name", nameof(before));
             }