refactor(tazjin/emacs): remove telephone-line

I don't really like this package, it's kinda wonky, and now that part
of my mode line logic is in the tab-bar, it's no longer needed.

Change-Id: I4791a75e5ce2f0c49ef0d239cadf6a4f81c73636
Reviewed-on: https://cl.tvl.fyi/c/depot/+/10171
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: tazjin <tazjin@tvl.su>
Tested-by: BuildkiteCI

users/tazjin/emacs/default.nix

@@ -88,7 +88,6 @@ pkgs.makeOverridable
       rust-mode
       sly
       string-edit-at-point
-      telephone-line
       terraform-mode
       undo-tree
       uuidgen