[13.x] default clear() queue driver param to null

[jackbayliss]

Tried to do this locally after tinkering & testing and got an error:

> Queue::clear();                                                                                                                             

   ArgumentCountError  Too few arguments to function Illuminate\Queue\DatabaseQueue::clear(), 0 passed in vendor\laravel\framework\src\Illuminate\Queue\QueueManager.php on line 407 and exactly 1 expected.****

If we default it to null, it'll use the default queue so no error.

This makes it the same as pop(), push(), size(), and every other method on the queue drivers already.

No B/C.. as it's just allowing null.

I was going to add this to all the drivers no op ie Sync etc, so its on the Facade as I think it would be useful, but not sure if you fancy that 😄 ... if you want that lmk, I'll do it!

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