playqueue: Use an appropriate icon for rebadged "remove playlist" action.
A JuK user pointed out that the Play Queue context menu shows "Hide" instead of "Remove Playlist" on the context menu, but that the icon still looks like a trash can, which is not appropriate for "Hide". I wasn't sure of a great icon to use either, but "list-remove" at least does not imply that the Play Queue is being tossed in the rubbish. BUG:336250 FIXED-IN:21.04
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