`radial_control_modal` would only actually update the target property
(via `RNA_property_update`) for the "standard" ways of confirming
(`LEFTMOUSE`, `EVT_PADENTER`, `EVT_RETKEY`).
When using "release_confirm" however, that was skipped, so added the
`RNA_property_update` now.
Pull Request: https://projects.blender.org/blender/blender/pulls/136884
1529710f44