`ModuleDeclState` is incorrectly changed to `NamedModuleImplementation`
for `struct module {}; void foo(module a);`. This is mostly benign but
leads to a spurious warning after #69555.
A real world example is:
```
// pybind11.h
class module_ { ... };
using module = module_;
// tensorflow
void DefineMetricsModule(pybind11::module main_module);
// `module main_module);` incorrectly changes `ModuleDeclState` to `NamedModuleImplementation`
#include <algorithm> // spurious warning
```
