Blender Git Loki

Geometry Nodes: Polish switch node UI

Based on the task T88006, there are a few simple changes
to make to improve the switch node:
- Change the label to "False" / "True" for clarity
- Change default to geometry, as it's the basic data container in
geometry nodes.
- Change node class to `NODE_CLASS_CONVERTOR`, which was an oversight
in the original patch.

I will add the new socket types (material and texture) in a separate commit.
Thanks to @EitanSomething for the original patch.

Differential Revision: https://developer.blender.org/D11165