Show unsupported message under wayland

[stefonarch]

Maybe we could change this in futere to a dialog "Open compositor settings if available?"

• if kwin: A list to open keyboard settings kcmshell6 kcm_keyboard or just launch systemsettings

• if wayfire launch wcm

• if labwc launch labwc-tweaks (atm not complete)

[stefonarch]

This has a bad side effect: at every login the message is shown, as lxqt-config-input --load-touchpad is executed.

[stefonarch]

Maybe we should disable loading touchpad settings under wayland. It does just nothing, no harm too. https://github.com/lxqt/lxqt-session/blob/fb537d535742f216c9bd113a575d163abf3cacae/lxqt-session/src/sessionapplication.cpp#L105