Removes the icon overlay from the taskbar button.
This method has no parameters.
This method does not return a value.
There are no standards that apply here.
This method clears an icon overlay that was previously set with the msSiteModeSetIconOverlay method. Icon overlays communicate alerts, notifications, and application status to users.
Each pinned site button on the taskbar can declare one icon overlay. If the taskbar button represents a group of windows, the icon overlay might be replaced by another in the group when it is removed.