applet: reload user configuration before accessing its values

Related to rhbz#1018307

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Configuration UI: instantly apply changes

Apply button is no more necessary.
Close button was superfluous.

Closes rhbz#1018307

Signed-off-by: Jakub Filak <jfilak@redhat.com>
Merge pull request #733 from abrt/rhbz1018307

pay attention to configuration changes