Relax the requirement for check_next_key_event() to <-60;60>

Relax the requirement for check_next_key_event() to <-60;60>

The original requirement for the check to pass was <-10;10> interval and
the first test was failing by 1 second.  As the minimum interval for
checking is 7200 seconds, the commit relaxes the requirement to <-60;60>
interval, which is still sane, but not that draconic.