A4-Tacks 62508aaca1
Fix extract_expressions_from_format_string on write!
**Input**:

```rust
fn main() {
    write!(f, "{2+3}$0")
}
```

**Old output**:

```rust
fn main() {
    write!("{}"$0, 2+3)
}
```

**This PR output**:

```rust
fn main() {
    write!(f, "{}"$0, 2+3)
}
```
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