save the settings after setting the annotation author

svn path=/branches/work/kde4/playground/graphics/okular/; revision=541262

ui/pageviewannotator.cpp

@@ -454,6 +454,7 @@ void PageViewAnnotator::setEnabled( bool on )
         }
         // save the name
         KpdfSettings::setAnnotationsAuthor( userName );
+        KpdfSettings::writeConfig();
     }
 }