Bug Fixes in KDE Base
Fix association-with-derived-mimetype again.
871cccc8a88a made it impossible to re-order file type associations.
7f42bf253009 fixed that, but changed the value of KService::mimeTypes(), which
broke okular. This new fix works the same way, but only inside kbuildsycoca
when it processes the mimetypes. The value of KService::mimeTypes() is now
restored to be exactly what's in the desktop file.