fix track2Pattern configuration

closes #533

Author: ar

jpos/src/main/java/org/jpos/transaction/participant/CheckFields.java

@@ -82,7 +82,7 @@ public void setConfiguration (Configuration cfg) {
         }
         String t2 = cfg.get("track2-pattern", null);
         if (t2 != null) {
-            track2Pattern = Pattern.compile(t1);
+            track2Pattern = Pattern.compile(t2);
         }
     }