Cane Holder v2

An improved cane holder. Compared to the [first version](https://www.thingiverse.com/thing:6678251) I made the support wider so it can be placed on thick tables. I added an horizontal bar that locks the cane in place. It can be used in two ways:
- On a high table or a shelf: the cane rests on the hooks and does not touch the floor.
- On a standard table, the cane rests on the floor and is held securely thanks to the horizontal bar.

The screw is taken from the original [Desk Mount Headphone Holder / Mount / Clamp](https://www.thingiverse.com/thing:2076034) and I added a removable cap so that the widened holder can still be attached to a thin surface.