multimedia/qmmp-qt6: update to 2.2.1 release (+)

Changes since 2.2.0:
    fixed build regression;
    fixed compatibility with Qt 6.2 (2.2.1 only);
    fixed "Always On Top" option for KDE/KWin in the skinned user interface;
    improved simple user interface:
    enabled floatable dock widgets under Wayland  (2.2.1 only);
    disabled "Always on Top" option under Wayland;
    updated Italian translation.

Changes since 2.1.9:
    added feature to stop playback after removing of the current track;
    reworked playlist container;
    reworked command-line parser;
    improved codebase;
    moved some duplicated code to the libqmmpui library;
    improved simple user interface:
    added feature to change group height;
    added feature to print cover art in the group;
    added feature to show extra information in the group;
    added feature to copy tracks between playlists;
    added tree view mode in the file browser;
    added feature to replace selected playlist from the file browser;
    added balance slider;
    allow to override group and current track colors when using system palette;
    renamed "Show Title Bars" action to "Block Floating Panels";
    improved skinned user interface:
    added feature to change group height;
    added feature to print cover art in the group;
    added feature to show extra information in the group;
    improved color and font settings;
    improved xmp plugin:
    added "Emulate sample loop bug" option;
    added "Use Paula mixer in Amiga modules" option;
    added feature to replace selected playlist in the library plugin;
    added feature to set buffer size in milliseconds in the http plugin;
    added buffer size setting in the WASAPI plugin;
    added "--debug" command-line option;
    added feature to build cdaudio plugin without libcddb library;
    disabled debug output by default;
    fixed file type detection by content;
    fixed ignoring of data file for large cue sheets;
    fixed build under FreeBSD;
    updated Dutch translation;
    updated Finnish translation;
    updated Polish translation;
    updated Russian translation.