Correct solid .desktop files

https://bugs.gentoo.org/show_bug.cgi?id=333723
(cherry picked from commit 7087eb30)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

share/solid/vlc-opencda.desktop

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

share/solid/vlc-opendvd.desktop

 [Desktop Entry]
-X-KDE-Solid-Predicate=[[ StorageVolume.ignored == false AND OpticalDisc.availableContent == '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;