Use parenthetical notation for Fn traits

Always use the `Fn(T) -> R` format when printing closure traits instead of `Fn<(T,), Output = R>`.

Fix #67100:

```
error[E0277]: expected a `Fn()` closure, found `F`
 --> file.rs:6:13
  |
6 |     call_fn(f)
  |     ------- ^ expected an `Fn()` closure, found `F`
  |     |
  |     required by a bound introduced by this call
  |
  = note: wrap the `F` in a closure with no arguments: `|| { /* code */ }`
note: required by a bound in `call_fn`
 --> file.rs:1:15
  |
1 | fn call_fn<F: Fn() -> ()>(f: &F) {
  |               ^^^^^^^^^^ required by this bound in `call_fn`
help: consider further restricting this bound
  |
5 | fn call_any<F: std::any::Any + Fn()>(f: &F) {
  |                              ++++++
```

compiler/rustc_hir_analysis/src/coherence/builtin.rs

@@ -554,7 +554,7 @@ fn infringing_fields_error(
                         if let ty::Param(_) = ty.kind() {
                             bounds.push((
                                 format!("{ty}"),
-                                trait_ref.print_only_trait_path().to_string(),
+                                trait_ref.print_trait_sugared().to_string(),
                                 Some(trait_ref.def_id),
                             ));
                         }