[Plugin: Custom Metadata Manager] Fix for send_to_editor_clone js function

Hello, thnx again for great module.

There is little bug in custom-metadata-manager.js in line 40:

if (!file_url) { imgurl = jQuery(html).attr('href'); }

Result must be saved to file_url variable rather than imgurl which is not exists.

This bug not allow save not image files to upload fields.

http://wordpress.org/extend/plugins/custom-metadata/