[clang-tidy] Fix false positive in modernize-pass-by-value

The check should not trigger on lvalue/rvalue overload pairs:

```
struct S {
  S(const A& a) : a(a) {}
  S(A&& a) : a(std::move(a)) {}

  A a;
}
```

Differential Revision: https://reviews.llvm.org/D116535