LibWeb: Move Origin into the HTML namespace

Origin is defined in the HTML Standard, and therefore belongs into the
HTML directory and namespace in LibWeb.
https://html.spec.whatwg.org/multipage/origin.html#origin

Userland/Libraries/LibWeb/HTML/Scripting/Environments.h

@@ -14,7 +14,7 @@
 #include <LibJS/Runtime/Realm.h>
 #include <LibWeb/HTML/BrowsingContext.h>
 #include <LibWeb/HTML/EventLoop/EventLoop.h>
-#include <LibWeb/Origin.h>
+#include <LibWeb/HTML/Origin.h>
 
 namespace Web::HTML {