Explicitly store UI values to prefs

This helper wasn't called as intended - but because of the syncSettings
call which emits settingsChanged this only became visible for the
default_filename.

Next I need to clean up what is called for the settingsChanged signal.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

qt-ui/preferences.cpp

@@ -172,9 +172,11 @@ void PreferencesDialog::buttonClicked(QAbstractButton* button)
 		close();
 		break;
 	case QDialogButtonBox::Apply:
+		setPrefsFromUi();
 		syncSettings();
 		break;
 	case QDialogButtonBox::FirstButton:
+		setPrefsFromUi();
 		syncSettings();
 		close();
 		break;