Better account for `FnOnce` in move errors

```
error[E0382]: use of moved value: `blk`
  --> $DIR/once-cant-call-twice-on-heap.rs:8:5
   |
LL | fn foo<F:FnOnce()>(blk: F) {
   |                    --- move occurs because `blk` has type `F`, which does not implement the `Copy` trait
LL |     blk();
   |     ----- `blk` moved due to this call
LL |     blk();
   |     ^^^ value used here after move
   |
note: `FnOnce` closures can only be called once
  --> $DIR/once-cant-call-twice-on-heap.rs:6:10
   |
LL | fn foo<F:FnOnce()>(blk: F) {
   |          ^^^^^^^^ `F` is made to be an `FnOnce` closure here
LL |     blk();
   |     ----- this value implements `FnOnce`, which causes it to be moved when called
```

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