fix(buffer): Disable tmp flag on buffer after edit

Fixes #827

Author: kristijanhusak

ftplugin/org.lua

@@ -65,5 +65,5 @@ vim.b.undo_ftplugin = table.concat({
   'foldexpr<',
   'formatexpr<',
   'omnifunc<',
-  '| unlet! b:org_bufnr',
+  '| unlet! b:org_bufnr b:org_tmp_edit_window',
 }, ' ')

lua/orgmode/utils/init.lua

@@ -538,6 +538,7 @@ function utils.edit_file(filename)
     end,
     close = function()
       vim.cmd('silent! w')
+      vim.b.org_tmp_edit_window = nil
       if buf_not_already_loaded then
         vim.cmd('silent! bw!')
       else