bugfix: createBalanceCache should return latest balance

getBalance and createBalanceCache used to be interchangeable.  With the
latest fix to use a safe maxId in createBalanceCache, we were not
returning the latest balance but the balance at safeMaxId time.

modules/minigl/src/main/java/org/jpos/gl/GLSession.java

@@ -1298,7 +1298,7 @@ else if (acct instanceof FinalAccount) {
                 session.saveOrUpdate (c);
             }
         }
-        return balance;
+        return getBalance(journal, acct, layers);
     }
 
     /**