Use G_LOG_LEVEL_MESSAGE for debugging messages.

G_LOG_LEVEL_DEBUG works fine when testing things from a terminal,
but when debugging something like xapp-sn-watcher at startup, the
logging won't show up in the journal/.xsession-errors unless it's
a message.

Use G_LOG_LEVEL_MESSAGE for debugging messages.

G_LOG_LEVEL_DEBUG works fine when testing things from a terminal,
but when debugging something like xapp-sn-watcher at startup, the
logging won't show up in the journal/.xsession-errors unless it's
a message.