Ville Penttinen 40add5de9a Fix join_lines not adding a comma after join_single_expr_block in match arm
We will also remove optional whitespace between the expression and the comma.

e.g.

```rust
fn foo() {
    let x = (<|>{
       4
    }   ,); // NOTE: whitespace
}
```

becomes

```rust
fn foo() {
    let x = (<|>4,);
}
```
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