Add an option to the setup assistant to skip configuring the path to
Blender. It will just use the `default` option, which causes the Workers
to try and find Blender on their own.
Fixes#104306
Reviewed-on: https://projects.blender.org/studio/flamenco/pulls/104306
Reviewed-by: Sybren A. Stüvel <sybren@blender.org>