test: cleanup

test/lib/meta/plugin/types.h

@@ -2,8 +2,7 @@
 #define ENTT_LIB_META_PLUGIN_TYPES_H
 
 #include <entt/locator/locator.hpp>
-
-class meta_ctx;
+#include <entt/meta/meta.hpp>
 
 struct userdata {
     entt::locator<entt::meta_ctx>::node_type ctx;