fix: stop using vim.wo to set window options

vim.wo also affects the global status of the option. We only want to set
the window-local option.

lua/oil/mutator/preview.lua

@@ -107,7 +107,7 @@ M.show = vim.schedule_wrap(function(actions, should_confirm, cb)
   vim.bo[bufnr].filetype = "oil_preview"
   vim.bo[bufnr].syntax = "oil_preview"
   for k, v in pairs(config.preview.win_options) do
-    vim.wo[winid][k] = v
+    vim.api.nvim_set_option_value(k, v, { scope = "local", win = winid })
   end
 
   render_lines(winid, bufnr, lines)