Resolve path for default_notes_file to support symlinks.

This fixes an issue where you would end up with two references to the
default file when using symlinks, since all other files had their
symlinks resolved but not this. This led to having one reference to the
full path of the file, and one reference to the symlink, giving symptoms
such as duplicate entries in the agenda.

Author: cheif

lua/orgmode/config/init.lua

@@ -69,7 +69,7 @@ end
 function Config:get_all_files()
   local all_filenames = {}
   if self.opts.org_default_notes_file and self.opts.org_default_notes_file ~= '' then
-    local default_full_path = vim.fn.expand(self.opts.org_default_notes_file, ':p')
+    local default_full_path = vim.fn.resolve(vim.fn.expand(self.opts.org_default_notes_file, ':p'))
     table.insert(all_filenames, default_full_path)
   end
   local files = self.opts.org_agenda_files