Explorer window inherits global spell option

[thefapinstructor]

Bug

The explorer window does not set spell = false in its win_options, so it inherits the global spell setting. If the user has vim.opt.spell = true, filenames in the explorer get spell-checked and underlined, which is undesirable.

Fix

Add spell = false to the win_options in lua/codediff/ui/explorer/render.lua:

win_options = {
  number = false,
  relativenumber = false,
  cursorline = true,
  wrap = false,
  signcolumn = "no",
  foldcolumn = "0",
  spell = false, -- add this
},