add gdefault in nvim config

modules/tui/neovim/config.nix

@@ -42,6 +42,10 @@ in {
                     useSystemClipboard = false;
 
                     luaConfigPost = concatStrings [
+                        # no need to add /g at the end of a search and replace
+                        ''
+                            vim.opt.gdefault = true
+                        ''
                         # https://github.com/NotAShelf/nyx/blob/main/homes/notashelf/programs/terminal/editors/neovim/lua/core.lua#L34-L42
                         ''
                             vim.opt.formatoptions:remove('c')