CKeditor: load $config['block_formats'] into CKeditor settings

There is a @todo in the recently committed CKeditor implementation, which causes the $config['block_formats'] value to be ignored:

  if (isset($config['block_formats'])) {
    // @todo This is now format_tags and needs format_[tag] settings per tag.
    //$settings['FontFormats'] = strtr($config['block_formats'], array(',' => ';'));
  }

Here is the patch.

In fact, it already seemed to work when I only replaced $settings['FontFormats'] with $settings['format_tags'], but I still added the foreach-part because the CKeditor docs say:

Each entry must have its relative definition configuration in a setting named "format_(tagName)".