LibWeb: Use resource scheme for icons in internal pages

Author: https://github.com/bplaat
Commit: b39d99cf2f
Pull-request: https://github.com/SerenityOS/serenity/pull/22437
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibWeb/Loader/GeneratedPagesLoader.h

@@ -11,8 +11,6 @@
 
 namespace Web {
 
-String resource_directory_url();
-void set_resource_directory_url(String);
 String error_page_url();
 void set_error_page_url(String);
 String directory_page_url();