gstreamer/pad: Use the correct type for destroying the pad task closure data
It's a Box<RefCell<_>> and not a plain Box<_> like for the other pad functions, and doing this wrong causes crashes at runtime.
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
It's a Box<RefCell<_>> and not a plain Box<_> like for the other pad functions, and doing this wrong causes crashes at runtime.