`BasicFormat` cannot indent closure body in tuple

### Description

`BasicFormat` cannot indent the closure body when it's nested in a `LabeledExprSyntax`.

### Steps to Reproduce

```swift
let builder = ExprSyntax(
"""
.init(
name: {
if let name {
return name
} else {
return "John"
}
}()
)
"""
)
assertBuildResult(
builder,
"""
.init(
name: {
if let name {
return name
} else {
return "John"
}
}()
)
"""
)
```

outputs:
```
Actual output (+) differed from expected output (-):
.init(
name: {
– if let name {
– return name
– } else {
– return "John"
– }
+ if let name {
+ return name
+ } else {
+ return "John"
+ }
}()
)
```