CmdPal: Fix alias UI clearing when toggling Direct/Indirect combobox (#45381)

## Summary of the Pull Request

This PR fixes the settings UI for the top-level command alias.



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## PR Checklist


https://github.com/user-attachments/assets/0d1e1392-0293-4482-97cb-e8e8c0ed0dd5


- [x] Closes: #41301
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## Detailed Description of the Pull Request / Additional comments

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## Validation Steps Performed

src/modules/cmdpal/Microsoft.CmdPal.UI.ViewModels/AliasManager.cs

@@ -107,7 +107,7 @@ public partial class AliasManager : ObservableObject
             }
 
             // Look for the alias belonging to another command, and remove it
-            if (newAlias is not null && kv.Value.Alias == newAlias.Alias)
+            if (newAlias is not null && kv.Value.Alias == newAlias.Alias && kv.Value.CommandId != commandId)
             {
                 toRemove.Add(kv.Value);