change_form first element focus no longer works.

[danielsamuels]

I'm not sure when it broke, but the line

<script type="text/javascript">document.getElementById("{{ adminform.first_field.id_for_label }}").focus();</script>

no longer works and throws a JS error. I fixed it in my project by replacing it with this:

<script type="text/javascript">$('form#{{ opts.model_name }}_form :input:not(.btn):visible:enabled:first').focus() </script>

[darklow]

Yes, there is pull request ready for this, i will fix it soon: #290