Maybe fix hand test failures (#21157)

Content.Client/Hands/Systems/HandsSystem.cs

@@ -95,7 +95,8 @@ namespace Content.Client.Hands.Systems
                     }
                 }
 
-                component.SortedHands = new(state.HandNames);
+                component.SortedHands.Clear();
+                component.SortedHands.AddRange(state.HandNames);
                 var sorted = addedHands.OrderBy(hand => component.SortedHands.IndexOf(hand.Name));
 
                 foreach (var hand in sorted)

Content.Shared/Hands/Components/HandsComponent.cs

@@ -97,8 +97,9 @@ public sealed class HandsComponentState : ComponentState
 
     public HandsComponentState(HandsComponent handComp)
     {
+        // cloning lists because of test networking.
         Hands = new(handComp.Hands.Values);
-        HandNames = handComp.SortedHands;
+        HandNames = new(handComp.SortedHands);
         ActiveHand = handComp.ActiveHand?.Name;
     }
 }

Content.Shared/Hands/EntitySystems/SharedHandsSystem.cs

@@ -69,9 +69,9 @@ public abstract partial class SharedHandsSystem
         if (!handsComp.Hands.Remove(handName, out var hand))
             return;
 
+        handsComp.SortedHands.Remove(hand.Name);
         TryDrop(uid, hand, null, false, true, handsComp);
         hand.Container?.Shutdown();
-        handsComp.SortedHands.Remove(hand.Name);
 
         if (handsComp.ActiveHand == hand)
             TrySetActiveHand(uid, handsComp.SortedHands.FirstOrDefault(), handsComp);