[aur-general] obsolete plasmoids removal

[A Rojas]

The following plasmoids are already included in upstream KDE:

spacer http://aur.archlinux.org/packages.php?ID=23591
qalculate http://aur.archlinux.org/packages.php?ID=18836
bookmarks http://aur.archlinux.org/packages.php?ID=33096