dynamicplaylist: Ensure subclasses handle virtual calls in dtor.
LGTM points out that DynamicPlaylist's destructor calls a function which indirectly leads to a virtual call (updateItems) in a potential subclass (SearchPlaylist). By C++ rules, SearchPlaylist has ceased to be a SearchPlaylist by the time DynamicPlaylist::~DynamicPlaylist() begins, so the virtual call would never actually be dispatched to SearchPlaylist. Fix by having SearchPlaylist do its own updating on destruction.
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