Use short type string in E0308 secondary span label

We were previously printing the full type on the "this expression has type" label.

```
error[E0308]: mismatched types
  --> $DIR/secondary-label-with-long-type.rs:8:9
   |
LL |     let () = x;
   |         ^^   - this expression has type `((..., ..., ..., ...), ..., ..., ...)`
   |         |
   |         expected `((..., ..., ..., ...), ..., ..., ...)`, found `()`
   |
   = note:  expected tuple `((..., ..., ..., ...), ..., ..., ...)`
           found unit type `()`
   = note: the full type name has been written to '$TEST_BUILD_DIR/diagnostic-width/secondary-label-with-long-type/secondary-label-with-long-type.long-type-3987761834644699448.txt'
   = note: consider using `--verbose` to print the full type name to the console
```

Reported in a comment of #135919.

0 files changed, 0 insertions, 0 deletions