Default to cancel button when uninstalling

src/Tkmm/ViewModels/Pages/ProfilesPageViewModel.cs

@@ -84,6 +84,7 @@ This cannot be undone.
             IsSecondaryButtonEnabled = true,
             PrimaryButtonText = "Uninstall Mod",
             SecondaryButtonText = "Cancel",
+            DefaultButton = ContentDialogButton.Secondary,
             Title = "Warning"
         };