Structured plain text formatting on private values ignore width specifiers

Please provide a succinct description of the issue.

**Repro steps**

Provide the steps required to reproduce the problem:

Script:
```fsharp
type Public = { Foo: string; Bar: int }

type private Private = { Baz: string; Quux: int option }

let pub = { Foo = "hello"; Bar = 42 }
let private priv = { Baz = "world"; Quux = Some 100 }

printfn "public"
printfn $"%0A{pub}"
printfn ""
printfn "private without '+'"
printfn $"%0A{priv}"
printfn ""
printfn "private with '+'"
printfn $"%0+A{priv}
```
Run with: `dotnet fsi Repro.fsx`

**Expected behavior**

[The documentation states](https://learn.microsoft.com/en-us/dotnet/fsharp/language-reference/plaintext-formatting#structured-values),
> Specifying a print width of 0 results in no print width being used. A single line of text will result, except where embedded strings in the output contain line breaks.

No fields of `priv` are embedded strings containing line breaks, therefore its string representation should be one line.

**Actual behavior**
The second group of prints, i.e. "private without '+'", spans more than one line:
```
public
{ Foo = "hello" Bar = 42 }

private without '+'
{ Baz = "world"
Quux = Some 100 }

private with '+'
{ Baz = "world" Quux = Some 100 }
```

**Known workarounds**

Add `+` to the format string.

**Related information**

Provide any related information (optional):

* Operating system: macOS 13.0.1
* .NET Runtime kind (.NET Core, .NET Framework, Mono): .NET 7