Fix warnings from requires filtering
    
    Avoid using %{name} in %{mozappdir} definition as it's expanded
    separately for each subpackage when doing requires filtering, which then
    leads to expanding it as /usr/lib64/firefox, /usr/lib64/firefox-x11,
    /usr/lib64/firefox-wayland etc, which is incorrect.
    
    Just spell out "firefox" instead of "%{name}" to avoid this.
    
    find: ‘/builddir/build/BUILDROOT/firefox-85.0-8.npgo.fc33.x86_64/usr/lib64/firefox-x11’: No such file or directory