xwayland: Fix wm_fd readin with no listen_fds

Since 08843efc KWin was not able to start a Wayland session. Independently
of listen_fd_count add_client_fd must be called. Same holds for the
wm_selection_callback. Therefore just remove the condition.

Bugzilla: https://bugs.freedesktop.org/109220

Signed-off-by: Roman Gilg <subdiff@gmail.com>
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