fix(neo-tree): use last window for preview (#3560)

Similar to "trouble.nvim" I want the preview to open in the last active
window. Currently the neo-tree preview opens in a floating window, which
(to me) doesn’t look very good.

What do you think about doing preview window the same everywhere
(trouble & neo-tree)?

## Before:


https://github.com/LazyVim/LazyVim/assets/3313023/7d7c21c9-158d-40ef-82f2-62e0dc795555

## After:


https://github.com/LazyVim/LazyVim/assets/3313023/bafc5bae-20cb-4dd1-8e40-1358ada573d9

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

lua/lazyvim/plugins/editor.lua

@@ -89,6 +89,7 @@ return {
             end,
             desc = "Open with System Application",
           },
+          ["P"] = { "toggle_preview", config = { use_float = false } },
         },
       },
       default_component_configs = {