Display ToolStrip RadioButton menu items as checkboxes

Author: sergiye

OpenHardwareMonitor/UI/MainForm.cs

@@ -478,6 +478,7 @@ private void PowerModeChanged(object sender, Microsoft.Win32.PowerModeChangedEve
 
     private void InitializeTheme()
     {
+        ToolStripRadioButtonMenuItem.DisplayAsCheckboxes = true;
         mainMenu.Renderer = new ThemedToolStripRenderer();
         treeContextMenu.Renderer = new ThemedToolStripRenderer();
         ThemedVScrollIndicator.AddToControl(treeView);