use normalize_path on windows and linux

Author: pynappo

Diff for: lua/neo-tree/utils/init.lua

@@ -864,6 +864,8 @@ M.normalize_path = function(path)
     path = vim.fs.normalize(path, { win = true })
     -- Now use backslashes, as expected by the rest of Neo-Tree's code
     path = path:gsub("/", M.path_separator)
+  else
+    path = vim.fs.normalize(path)
   end
   return path
 end