feature-pre-xpra.sh.in: add xpra_ipc_path to extra_dir_cleanup list, so it will be removed at bwrap_launcher.sh cleanup stage
feature-pre-xpra.sh.in: add xpra_ipc_path to extra_dir_cleanup list, so it will be removed at bwrap_launcher.sh cleanup stage

DarkCaster/Sandboxer,DarkCaster/Sandboxer