revert test error (#62)

Author: dothebart

simple/test.js

@@ -1613,7 +1613,7 @@ exports.test = function (testParams) {
 
     indexCollectAggregate = function (params) {
       db._query(
-        "FOR docxxx IN @@c COLLECT group = doc.value1 AGGREGATE agg = SUM(doc.value2) RETURN [group, agg]",
+        "FOR doc IN @@c COLLECT group = doc.value1 AGGREGATE agg = SUM(doc.value2) RETURN [group, agg]",
         { "@c": params.collection },
         {},
         { silent }