Fix KDE solid predicate

This partially reverts commit 99ebae0c.
(see http://techbase.kde.org/Development/Tutorials/Solid/Device_Actions)

share/solid/vlc-opendvd.desktop

 [Desktop Entry]
-X-KDE-Solid-Predicate=[ StorageVolume.ignored == false AND OpticalDisc.availableContent == 'Data|VideoDvd' ]
+X-KDE-Solid-Predicate=[ StorageVolume.ignored == false AND OpticalDisc.availableContent & 'VideoDvd' ]
 Type=Service
 Actions=open;
 

share/solid/vlc-openvcd.desktop

 [Desktop Entry]
-X-KDE-Solid-Predicate=[ StorageVolume.ignored == false AND OpticalDisc.availableContent == 'VideoCd|SuperVideoCd' ]
+X-KDE-Solid-Predicate=[ StorageVolume.ignored == false AND OpticalDisc.availableContent & 'VideoCd|SuperVideoCd' ]
 Type=Service
 Actions=open;