Timeline markers get a default name of "F_<frame>" when creating with
`marker.add`, but an empty name with `marker.camera_bind`.
Because the name of the current frame's marker is displayed in the
viewport statistics, such markers appear as "<>" after the name of the
active object, which is confusing.
This change gives the same default name of "F_<frame>" to markers
created this way.
It also cleans up a comment in the line copied from, as that line was
introduced in late 2008 so probably not so temporary.
Pull Request: https://projects.blender.org/blender/blender/pulls/122968
2948b1e790