Description of problem:

The default config created by `i3-config-wizard` has an issue, as it tries to create duplicate keybinding for $mod+d in `.config/i3/config`

Those two duplicate keybindings are following (for dmenu):

- bindsym $mod+d exec --no-startup-id dmenu_run
- bindsym $mod+d exec --no-startup-id i3-dmenu-desktop


Version-Release number of selected component (if applicable): i3 version 4.19 (2020-11-15)


How reproducible: Can be reproduced on New installations where precious config dosen't exist.


Steps to Reproduce:
1. Install i3 by running: `dnf install i3`
2. Once i3 window manager is installed, reboot and select i3 in your display manager.
3. As i3 is running for the first time, it'll run the i3-config-wizard which will ask for setting the mod key, once it's set.
4. It'll result in an error now, as the default config created by i3-config-wizard is trying to duplicate keybindings in the config file.

Actual results:

It results in an error due to multiple key bindings for dmenu.


Expected results:

The config wizard should work fine, without errors.

Additional info: