fix(snippet): don't set navigation mappings in nightly (#4375)

## Description

Since [this commit in
Neovim](https://github.com/neovim/neovim/pull/27339), snippet navigation
mappings are set by default to `<tab>` and `<s-tab>`, and hence don't
need to be redefined here. Moreover, the core implementation makes sure
that those snippet navigation mappings are active only when snippet
expansion is happening, and if other user bindings are using those keys,
they're restored when snippet navigation ends.

## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/coding.lua

@@ -105,26 +105,17 @@ return {
         table.insert(opts.sources, { name = "snippets" })
       end
     end,
-    keys = {
-      {
-        "<Tab>",
-        function()
+    init = function()
+      -- Neovim enabled snippet navigation mappings by default in v0.11
+      if vim.fn.has("nvim-0.11") == 0 then
+        vim.keymap.set({ "i", "s" }, "<Tab>", function()
           return vim.snippet.active({ direction = 1 }) and "<cmd>lua vim.snippet.jump(1)<cr>" or "<Tab>"
-        end,
-        expr = true,
-        silent = true,
-        mode = { "i", "s" },
-      },
-      {
-        "<S-Tab>",
-        function()
+        end, { expr = true, silent = true })
+        vim.keymap.set({ "i", "s" }, "<S-Tab>", function()
           return vim.snippet.active({ direction = -1 }) and "<cmd>lua vim.snippet.jump(-1)<cr>" or "<S-Tab>"
-        end,
-        expr = true,
-        silent = true,
-        mode = { "i", "s" },
-      },
-    },
+        end, { expr = true, silent = true })
+      end
+    end,
   },
 
   -- auto pairs