fix KDE file dialog setting checkboxes to true

No idea how long this has been broken, or if it ever worked,
but inserting a picture sets the 'link' and 'preview' checkboxes to true
for the next time (as getValue() returns void*, which gets silently
converted to bool *sigh*).

Change-Id: I6af0e09ac5e475fc9ff04cd7f937af0bc7aeea77

vcl/unx/kde4/KDE4FilePicker.cxx

@@ -362,7 +362,7 @@ void SAL_CALL KDE4FilePicker::setValue( sal_Int16 controlId, sal_Int16, const un
             case ExtendedFilePickerElementIds::CHECKBOX_SELECTION:
             {
                 QCheckBox* cb = dynamic_cast<QCheckBox*>(widget);
-                cb->setChecked(value.getValue());
+                cb->setChecked(value.get<bool>());
                 break;
             }
             case ExtendedFilePickerElementIds::PUSHBUTTON_PLAY: