Copter: bug fix for loiter_time check

loiter_time_max was changed to hold the loiter time in seconds
(previously it was milliseconds) in order to allow the delay to be more
than 65 seconds but the verify_loiter_time check was missed from that
change

ArduCopter/commands_logic.pde

@@ -475,7 +475,7 @@ static bool verify_loiter_time()
     }
 
     // check if loiter timer has run out
-    return ((millis() - loiter_time) > loiter_time_max);
+    return (((millis() - loiter_time) / 1000) >= loiter_time_max);
 }
 
 // verify_circle - check if we have circled the point enough