Settings form is not saving values

The settings form is not (correctly) saving values do to a few issues with the system settings from:

• The $form['swfobject_api_settings'] fieldset is causing the swfoa_version and swfoa_express variables to be stored as an array of values named swfobject_api_settings
• The default value for the swfoa_version field is being set to swfoa_express.
• An extra submit button is being added to the form due to the inclusion of an unneeded $form['submit'] definiton in the form.

This patch fixes all of these issues with the form.