fixed bug that crashes the plugin on load

[Maxb0tbeep]

commented out the line that logs the user's username, see https://github.com/andweeb/presence.nvim/issues/139#issuecomment-1823587392

I think this broke because of the new-ish username system and this variable might not exist anymore? whatever, it's hacky, but it works.

[jiriks74]

Hello, if you'd like you can transfer this PR to my repository and we can take a look at it.