nvim: lua: plugins: Drop vim-tmux-focus-events

This plugin is now obsolete and no longer needed as both neovim and vim
(since version 8.2.2345) have native support for this functionality.

nvim/.config/nvim/lua/plugins.lua

@@ -36,8 +36,6 @@ local init = function ()
     'hrsh7th/nvim-compe',
     config = "require('modules.completion')"
   }
-  -- For tmux
-  use 'tmux-plugins/vim-tmux-focus-events'
   -- Git support
   use {
     'mhinz/vim-signify',