This removes the 'Already loaded' output that occurs when the plugin is loaded twice.
I get this error each time I start neovim b/c of a recent change to home-manager that
manages my neovim/ plugins. While the change could be reverted to remove this warning, the
change is nice b/c it allows me to run neovim without using the neovim packaged by nixpkgs
and still find my plugins.