fixed 16-color detection

nvim/lua/darcula/plugins.lua

@@ -19,6 +19,9 @@
 --
 require("darcula.config")
 
+-- The colorscheme is loaded from this module, before darcula.options.
+vim.opt.termguicolors = NV_DARCULA_TERMGUI_COLORS
+
 vim.api.nvim_create_autocmd(
   "PackChanged",
   {