fix: escape curly braces in XAML document icon

Author: CalvinAllen

src/CodingWithCalvin.CouchbaseExplorer/CouchbaseExplorerWindowControl.xaml

@@ -119,7 +119,7 @@
         <!-- Data Template for Document Node -->
         <DataTemplate DataType="{x:Type vm:DocumentNode}">
             <StackPanel Orientation="Horizontal">
-                <TextBlock Text="{ }" Margin="0,0,5,0" FontFamily="Consolas" />
+                <TextBlock Text="{}{ }" Margin="0,0,5,0" FontFamily="Consolas" />
                 <TextBlock Text="{Binding Name}" />
             </StackPanel>
         </DataTemplate>