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util.promise: Remove some redundant checks, add tests confirming redundancy This lines don't appear to do anything useful, and all tests pass when they are removed. Discovered via mutation testing. I added extra tests to exercise this code, because I wasn't certain that there were no side-effects caused by removal. Everything appears to be fine, thanks to the "pending" check at the start of promise_settle().

local record util_timer
	record task end
	type timer_callback = function (number) : number
	add_task : function ( number, timer_callback, any ) : task
	stop : function ( task )
	reschedule : function ( task, number ) : task
end
return util_timer