Don't Close Window On fs.remove() When Last Buffer In Window

Problem
When there's just 1 window opened along with nvimtree, then deleting its file from tree, would make nvimtree become fullscreen

Desired behavior
Nvimtree should open unamed buf ( enew ) and then delete, this will maintain the win layout!

 actions = {
    remove_file = {
      open_unamed_buf = true,
    },
  },

Possible solutions with edgecases

The code must be run only when the user presses "y"

Case 1

If there's just 1 listed buffer and its the active window

• Add empty buffer i.e enew
• delete

Reproduce the one-window case in nvim-tree and trace the fs.remove action reached when the user presses "y". Check the behavior when the last listed buffer is active, then verify that the window layout is preserved and the file is still deleted after handling the unnamed buffer case.