CmdPal: Fix type rename missed during merge gap (#46599)

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## Summary of the Pull Request

See title

Regressed by: 4cb3359314

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src/modules/cmdpal/Microsoft.CmdPal.UI/Dock/PinToDockDialogContent.xaml

@@ -60,7 +60,7 @@
                             Width="16"
                             Height="16"
                             VerticalAlignment="Center"
-                            SourceRequested="{x:Bind help:IconCacheProvider.SourceRequested20}" />
+                            SourceRequested="{x:Bind help:IconProvider.SourceRequested20}" />
 
                         <!--  Text  -->
                         <StackPanel