Merge pull request #550 from gem-neo4j/fix-exists-aggregation-test

Update to use n as the grouping key, instead of m in Exists Aggregation Acceptance test

tck/features/expressions/existentialSubqueries/ExistentialSubquery2.feature

@@ -64,7 +64,7 @@ Feature: ExistentialSubquery2 - Full existential subquery
       """
       MATCH (n) WHERE exists {
         MATCH (n)-->(m)
-        WITH m, count(*) AS numConnections
+        WITH n, count(*) AS numConnections
         WHERE numConnections = 3
         RETURN true
       }