ass_cache: don't increment refcount on cache hitsHEADmaster

Items retrieved from cache are always kept until at least the end of the frame,
so there's no need to explicitly ref them when they're only used intra-frame.
Instead, explicitly ref items when we'll be keeping them around for longer
(e.g. as part of another cache item's key).

Note that ass_shaper already depended on cache items never being released
mid-frame prior to this change.

This will save massively on atomic contention later.

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