Rollup merge of #144657 - Muscraft:fix-unicode-close-window, r=fee1-dead

fix: Only "close the window" when its the last annotated file

While comparing the Unicode theme output of `rustc` and `annotate-snippets`, I found that `rustc` would ["close the window"](https://github.com/rust-lang/rust/blob/686bc1c5f9c06762b18082434c04d514acf6707e/compiler/rustc_errors/src/emitter.rs#L1025-L1027) (draw a `╰╴`), even though there were other annotated files that followed the current one. This PR makes it so the emitter will only "close the window" on the last annotated file.

Before:
```
error[E0624]: method `method` is private
   ╭▸ $DIR/close_window.rs:9:7
   │
LL │     s.method();
   ╰╴      ━━━━━━ private method
   │
   ⸬ $DIR/auxiliary/close_window.rs:3:5
   │
LL │     fn method(&self) {}
   ╰╴    ──────────────── private method defined here
```

After:
```
error[E0624]: method `method` is private
   ╭▸ $DIR/close_window.rs:9:7
   │
LL │     s.method();
   │       ━━━━━━ private method
   │
   ⸬ $DIR/auxiliary/close_window.rs:3:5
   │
LL │     fn method(&self) {}
   ╰╴    ──────────────── private method defined here
```

0 files changed, 0 insertions, 0 deletions