fix: close walker menu when already open with keybind

[ASH-WIN-10]

When you open omarchy menu, system menu or keybinds list menu with the specified keybind, pressing the keybind again does not close it rather shows "No Results" in the same menu.

Example:

1. Open omarchy menu with SUPER + ALT + SPACE
2. Press same keybind again while it is open. It will show "No Results".

The intended behavior should be to close the already open menu.

[HegewaldK]

There is a parameter in walker/config.toml for this: close_when_open = true
This is not part of the default Omarchy config, but maybe it's what you want.

[ASH-WIN-10]

That is turned on by default in walker.
The issue probably has to do with how omarchy launches the menu because this is not a issue if you open the applications menu with SUPER + SPACE