Account for HRTB on unsatisfied trait bound suggestions

[estebank]

When encountering a higher-ranked-trait-bound error where the compiler would suggest adding a new where bound that is the same as an existing bound, the suggestion should be to replace the existing one with the hrtb version:

before:

error[E0277]: the trait bound `for<'tcx> F: Foo<'tcx>` is not satisfied
  --> $DIR/hrtb-higher-ranker-supertraits.rs:18:26
   |
LL |     where F : Foo<'x>
   |                      - help: consider further restricting type parameter `F`: `, F: for<'tcx> Foo<'tcx>`
...
LL |     want_foo_for_any_tcx(f);
   |                          ^ the trait `for<'tcx> Foo<'tcx>` is not implemented for `F`
...
LL | fn want_foo_for_any_tcx<F>(f: &F)
   |    --------------------
LL |     where F : for<'tcx> Foo<'tcx>
   |               ------------------- required by this bound in `want_foo_for_any_tcx`

after:

error[E0277]: the trait bound `for<'tcx> F: Foo<'tcx>` is not satisfied
  --> $DIR/hrtb-higher-ranker-supertraits.rs:18:26
   |
LL |     where F : Foo<'x>
   |           ----------- help: consider restricting type parameter `F` with HRTB: `F: for<'tcx> Foo<'tcx>`
...
LL |     want_foo_for_any_tcx(f);
   |                          ^ the trait `for<'tcx> Foo<'tcx>` is not implemented for `F`
...
LL | fn want_foo_for_any_tcx<F>(f: &F)
   |    --------------------
LL |     where F : for<'tcx> Foo<'tcx>
   |               ------------------- required by this bound in `want_foo_for_any_tcx`

[Dylan-DPC]

this code no longer errors and now compiles so we would need another sample if this error still occurs