LibWeb: Remove circular include NavigatorBeacon.h <-> Navigator.h

NavigatorBeaconMixin doesn't even need to know about Navigator

Userland/Libraries/LibWeb/HTML/NavigatorBeacon.h

@@ -7,7 +7,6 @@
 #pragma once
 
 #include <LibWeb/Fetch/BodyInit.h>
-#include <LibWeb/HTML/Navigator.h>
 #include <LibWeb/WebIDL/ExceptionOr.h>
 
 namespace Web::HTML {