pympress: unbreak

`pympress` currently crashes:

```console
$ pympress
Traceback (most recent call last):
  ...
  File "/usr/lib/python3.13/site-packages/pympress/builder.py", line 79, in __translate_widget_strings
    for str_prop in (prop.name for prop in a_widget.props if prop.value_type == GObject.TYPE_STRING):
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.13/site-packages/pympress/builder.py", line 79, in <genexpr>
    for str_prop in (prop.name for prop in a_widget.props if prop.value_type == GObject.TYPE_STRING):
                                           ^^^^^^^^^^^^^^
TypeError: 'gi._gi.GPropsIter' object is not iterable
```

This isn't really a pympress bug, it's an unfortunate interaction
between Python 3 and pygobject. See
<https://github.com/Cimbali/pympress/issues/330> for details.

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