replace default phonon-gstreamer to phonon-vlc in KDE packages

phonon-vlc (this is the only maintained and supported Phonon backend for KDE apps that use Phonon for their multimedia needs; the alternative phonon-gstreamer has been unmaintained since 2013 and should not be shipped by default, or at all, ideally)
source: https://community.kde.org/Distributions/Packaging_Recommendations

src/utils.cpp

@@ -811,7 +811,7 @@ auto get_pkglist_desktop(const std::string_view& desktop_env) noexcept -> std::v
             "kinit", "kwallet-pam", "kwalletmanager", "plasma-wayland-protocols", "plasma-wayland-session",
             "plasma-desktop", "plasma-nm", "plasma-pa", 
             "plasma-firewall", "plasma-browser-integration", "plasma-systemmonitor", "plasma-thunderbolt",
-            "ksysguard", "spectacle", "sddm-kcm", "xsettingsd"};
+            "ksysguard", "spectacle", "sddm-kcm", "xsettingsd", "phonon-qt5-vlc"};
         /* clang-format on */
         pkg_list.insert(pkg_list.end(), std::move_iterator(to_be_inserted.begin()),
             std::move_iterator(to_be_inserted.end()));