CmdPal: Fix exception logging in ContentFormViewModel (#42460)

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## Summary of the Pull Request

This PR fixes logging entry. The invocation resembled a semantic logger
call, but its signature doesn’t match ManagedCommon.Logger. As a result,
it logged the placeholder text instead of the intended exception value:
```log
[01:43:41.8235422] [Error] ContentFormViewModel.cs::Unexpected HRESULT has been returned from a call to a COM component.::55
    Error building card from template: {Message}
```

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## PR Checklist

- [ ] Closes: #xxx
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## Validation Steps Performed

Co-authored-by: Michael Jolley <mike@baldbeardedbuilder.com>

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

@@ -52,7 +52,7 @@ public partial class ContentFormViewModel(IFormContent _form, WeakReference<IPag
         }
         catch (Exception ex)
         {
-            Logger.LogError("Error building card from template: {Message}", ex.Message);
+            Logger.LogError("Error building card from template", ex);
             error = ex;
             return false;
         }