Ben Greenhalgh saw enough to believe Margate can finish the job in their FA Cup replay at Horsham. The sides drew 1-1 in the third qualifying round at Hartsdown Park on Saturday, with the replay taking place on Tuesday night. Gate led through Ibrahim Olutade but the Isthmian Premier Hornets rescued a draw when Ola Oluwamide struck with 20 minutes left. Player-boss Greenhalgh was encouraged by his team’s performance, with Margate the last Isthmian South East side standing going into Monday’s final qualifying round draw. “I’m really positive at how frustrated and disappointed we are that we have…