LPS-45321 - When selecting a new scope in Control Panel we should refresh the portlet being displayed

Hi @jonmak08,

Attached is an update for https://issues.liferay.com/browse/LPS-45321.

As per @JorgeFerrer's recommendation, I added a portal method to PortalUtil/Impl that strips the url of parameters with the given namespace.

Please let me know if there are any issues.

Thanks!