Update auto-deref recursion_limit example

[nikic]

This updates the auto-deref recursion_limit example for rust-lang/rust#82834. Previously this actually hit the recursion limit while evaluating the Freeze bound, not during auto-deref. The current example only needs one level of deref to reach the argument type. This adds one more level of nesting, so that two derefs are actually needed, and recursion_limit is hit during auto-deref and not sometime later:

error[E0055]: reached the recursion limit while auto-dereferencing `&{integer}`
 --> test14.rs:5:19
  |
5 |     (|_: &u8| {})(&&&1);
  |                   ^^^^ deref recursion limit reached
  |
  = help: consider adding a `#![recursion_limit="2"]` attribute to your crate (`test14`)

Previously:

error[E0275]: overflow evaluating the requirement `(): marker::Freeze`
  |
  = help: consider adding a `#![recursion_limit="2"]` attribute to your crate (`test14`)
  = note: required because it appears within the type `[closure@test14.rs:5:5: 5:18]`

[ehuss]

Thanks!

Feel free to update the submodule in your PR, let me know if you need any help with that.