Fix CreateDialog returning wrong type

[KoBeWi]

Fixes #113498

A better fix would be doing what instantiate_selected() does

godot/editor/gui/create_dialog.cpp

Lines 640 to 644 in 2ecefad

	Array meta = selected->get_metadata(0).operator Array();
	ERR_FAIL_COND_V(meta.size() != 2, Variant());
	bool is_custom_type = meta[0].operator bool();
	String type_name = meta[1].operator String();

but for now it's safer to just get slice.

[Repiteo]

Thanks!