fixup! refactor predicate cache into its own class

The call to actually get the cached predicates was somehow missed when
this change was ported from our internal code base. Fix this by calling
getPredicate().

Change-Id: Ifc67b7cbc63258972a35beecdc76d2196621455b
diff --git a/src/main/java/com/googlesource/gerrit/plugins/task/PredicateCache.java b/src/main/java/com/googlesource/gerrit/plugins/task/PredicateCache.java
index 0921db1..aa3da13 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/task/PredicateCache.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/task/PredicateCache.java
@@ -59,7 +59,7 @@
     if ("true".equalsIgnoreCase(query)) {
       return true;
     }
-    return cqb.parse(query).asMatchable().match(c);
+    return getPredicate(query).asMatchable().match(c);
   }
 
   protected Predicate<ChangeData> getPredicate(String query) throws QueryParseException {