set fixed score for URIBL_MW_SURBL

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1562704 13f79535-47bb-0310-9956-ffa450edef68
nailed URIBL_MW_SURBL

git-svn-id: https://svn.apache.org/repos/asf/spamassassin/trunk@1562705 13f79535-47bb-0310-9956-ffa450edef68