Revert "feat(nvim): do not install missing plugins in headless mode"

This reverts commit 7f2534a1fd.

home/.config/nvim/lua/config/lazy.lua

@@ -1,4 +1,3 @@
-local is_headless = #vim.api.nvim_list_uis() == 0
 local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
 if not (vim.uv or vim.loop).fs_stat(lazypath) then
   local lazyrepo = "https://github.com/folke/lazy.nvim.git"
@@ -31,7 +30,7 @@ require("lazy").setup({
     version = false, -- always use the latest git commit
     -- version = "*", -- try installing the latest stable version for plugins that support semver
   },
-  install = { missing = not is_headless, colorscheme = { "tokyonight", "habamax" } },
+  install = { missing = true, colorscheme = { "tokyonight", "habamax" } },
   checker = {
     enabled = false, -- check for plugin updates periodically
     notify = false, -- notify on update