dini: fix unused parameter
see
#include <kdbhelper.h>
-int elektraDiniOpen (Plugin * handle, Key * errorKey)
+int elektraDiniOpen (Plugin * handle, Key * errorKey ELEKTRA_UNUSED)
{
Dini * dini = elektraMalloc (sizeof (Dini));
dini->dump = elektraInvokeOpen ("dump", ksDup (elektraPluginGetConfig (handle)));
