HPCC-23507 Move filter pointer when checking thor time filter

This fixes a bug in PR-13137 in cassandrawu's getWorkUnitsSorted().

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>

plugins/cassandra/cassandrawu.cpp

@@ -3430,6 +3430,7 @@ public:
                     keepThorTimeFilter = true;
                     break;
                 }
+                filterPtr++;
             }
         }