[clang format] `PointerAlignment` not respected in `requires` clauses

With above code, with `PointerAlignment = PAS_Left`
```
template
concept dummy = true;

template
requires(dummy) // KO: extra space before &&
void foo()(Args&&...) { // OK
if (dummy) { // OK
}
}

int main() {}
```

`Args && ...` should be `Args&& ...`

Tested with clang-format 20.1.8

Start by reproducing the example with clang-format 20.1.8 using PointerAlignment = PAS_Left, then trace how requires clauses format Args && .... Done means the output uses Args&& ... in the requires clause while preserving the already-correct formatting elsewhere.

Written by the indexing model from the issue text.