Fix tst_QXmlQuery::evaluateToReceiver failure.

This patch fixes a test failure introduced by
15da0a5af20fe6771bcb94ef8d46edbd5c8fb64c.

Change the date format in allAtomics.ref file to include milliseconds.

Change-Id: I8786e04976872da87cbc322d322c394cb0c62a67
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>