ButtonEditor is not correctly initialized when the view is opened

I am opening an issue because it seems that this is a bug. I use a `ButtonEditor` with `style="radio"` for a `Bool` trait. When the view oipen, the button does not appear like clicked, even if the trait is set to True.

Here is a code to reproduce this issue:

```
from traits.api import Bool, HasStrictTraits
from traitsui.api import ButtonEditor, UItem, View

class BoolWithButton(HasStrictTraits):

bool_trait = Bool(True)

def default_traits_view(self):
return View(
UItem(
"bool_trait",
style="custom",
editor=ButtonEditor(value=True, style="radio"),
),
width=300,
height=300,
)

if __name__ == "__main__":
bb = BoolWithButton()
bb.configure_traits()
```

Start by running the provided BoolWithButton reproduction with TraitsUI and inspect how ButtonEditor(value=True, style="radio") is initialized when the view opens. Trace the editor's connection to the Bool trait; done means the radio-style button appears selected when bool_trait starts as True, with a regression test covering the example.

Written by the indexing model from the issue text.