Blender Git Loki

Geometry Nodes: Allow for one vertex in grid node

This commit allows setting the number of vertices in either direction
to 1, so that the primitive grid node will create a line instead of a
grid. To avoid confusion the soft limits of the input sockets are not
changed, so this is purely an increase in flexibility for when it is
helpful.

Differential Revision: https://developer.blender.org/D11772