Reduce size of last endpoint gizmo on line primitives `size_primary` 8.0f to be the same size of `size_tertiary` 3.0f. Circle and Box primitives are unchanged as they don't have endpoints and a bigger gizmo doesn't affect visibility. Motivation for this change is to increase visibility of the endpoint while drawing since the default is too big for these type of lines and it blocks the view of it. Pull Request: https://projects.blender.org/blender/blender/pulls/135658