fix(snippets): nvim-snippets <S-Tab> prev key (#3712)

Fix nvim-snippets' <S-Tab> rollback keymap.

lua/lazyvim/plugins/coding.lua

@@ -103,7 +103,7 @@ return {
       {
         "<S-Tab>",
         function()
-          return vim.snippet.active({ direction = -1 }) and "<cmd>lua vim.snippet.jump(-1)<cr>" or "<Tab>"
+          return vim.snippet.active({ direction = -1 }) and "<cmd>lua vim.snippet.jump(-1)<cr>" or "<S-Tab>"
         end,
         expr = true,
         silent = true,