Fix DataGrid navigation tree indentation

Co-authored-by: csharpfritz <78577+csharpfritz@users.noreply.github.com>

Author: Copilot

samples/AfterBlazorServerSide/Components/Layout/NavMenu.razor

@@ -48,11 +48,11 @@
 						<TreeNode NavigateUrl="/ControlSamples/DataList/RepeatColumns" Text="Repeat Columns" />
 					</TreeNode>
 
-				<TreeNode Text="DataGrid" NavigateUrl="/ControlSamples/DataGrid" Expanded="false">
-					<TreeNode NavigateUrl="/ControlSamples/DataGrid" Text="Default" />
-					<TreeNode NavigateUrl="/ControlSamples/DataGrid/AutoGeneratedColumns" Text="Auto-Generated Columns" />
-					<TreeNode NavigateUrl="/ControlSamples/DataGrid/ShowHideHeader" Text="Show/Hide Header" />
-				</TreeNode>
+					<TreeNode Text="DataGrid" NavigateUrl="/ControlSamples/DataGrid" Expanded="false">
+						<TreeNode NavigateUrl="/ControlSamples/DataGrid" Text="Default" />
+						<TreeNode NavigateUrl="/ControlSamples/DataGrid/AutoGeneratedColumns" Text="Auto-Generated Columns" />
+						<TreeNode NavigateUrl="/ControlSamples/DataGrid/ShowHideHeader" Text="Show/Hide Header" />
+					</TreeNode>
 
           <TreeNode Text="FormView">
               <TreeNode NavigateUrl="/ControlSamples/FormView/Simple" Text="Simple Readonly Form" />