Remove optdepends on webkit2gtk
Web Lyrics plugin was removed in https://github.com/quodlibet/quodlibet/commit/b973220cccc9f3cdb411e68f595d2c79bf4bf76a.
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Web Lyrics plugin was removed in https://github.com/quodlibet/quodlibet/commit/b973220cccc9f3cdb411e68f595d2c79bf4bf76a.