nixpkgs/neovim: remove nix from treesj config

Upstream now has nicer support for this.

.config/nixpkgs/neovim/plugins.lua

@@ -156,29 +156,6 @@ local tsj_utils = require('treesj.langs.utils')
 -- Treesitter-aware split/join
 require('treesj').setup({
   use_default_keymaps = false,
-
-  langs = {
-    nix = {
-      list_expression = tsj_utils.set_preset_for_list({
-        both = {
-          separator = '',
-        },
-      }),
-      binding_set = tsj_utils.set_preset_for_non_bracket(),
-      let_expression = {
-        target_nodes = { 'binding_set' },
-      },
-      attrset_expression = {
-        target_nodes = { 'binding_set' },
-      },
-
-      -- this is a bit janky with the indentation
-      inherited_attrs = tsj_utils.set_preset_for_non_bracket(),
-      inherit = {
-        target_nodes = { 'inherited_attrs' },
-      },
-    },
-  },
 })
 
 -- completion