Inconsistent Turtle writer

### Version

6.1.0

### What happened?

I know this is very minor but the difference in the whitespace before punctuation is triggering me 😅 I did not use to be like this before version 6 IIRC.

### Relevant output and stacktrace

```turtle
,
;
```

### Are you interested in making a pull request?

Maybe

Start at Jena's Turtle writer entry point and reproduce the output shown in the issue. Trace how whitespace is emitted before ',' and ';', then verify that the writer uses one consistent convention and that relevant regression coverage passes.

Written by the indexing model from the issue text.