Remove error that breaks scheduler

No one really seems to be maintainer the `php-resque-scheduler` project anymore, and your fork was a better place to start at, so... not really sure what to do.

Credis does some `array_walk` thing that appears not to be recursive or something and the array parameter on one of the function calls in this lib has an array that causes an error and makes the scheduler not work. Removing that parameter doesn't seem to have any side-effects I can see... but fixes the error and makes the scheduler work again for me.