[6.56] "Add rendered items to new tracks in project" render option bug

[BenjyO]

The "Add rendered items to new tracks in project" option in the render dialog isn't obeyed when the "Return to render setup" option is checked in the "Rendering to file..." window. No new track is created (the file is rendered though).
It only works properly when the "Close render windows" option is checked.

[schwa]

Fixing, thanks for the report.