fix: termopen previewer (#1901)

- buffer leaking
- still insert mode on confirm

lua/telescope/actions/init.lua

@@ -345,13 +345,11 @@ end
 actions.close = function(prompt_bufnr)
   action_state.get_current_history():reset()
   local picker = action_state.get_current_picker(prompt_bufnr)
-  local prompt_win = state.get_status(prompt_bufnr).prompt_win
   local original_win_id = picker.original_win_id
 
   actions.close_pum(prompt_bufnr)
 
-  vim.api.nvim_win_close(prompt_win, true)
-  pcall(vim.cmd, string.format([[silent bdelete! %s]], prompt_bufnr))
+  require("telescope.pickers").on_close_prompt(prompt_bufnr)
   pcall(a.nvim_set_current_win, original_win_id)
 end