MONITOR: Don't expose monitor_common_send_id()
As this function is only called by sss_monitor_init(), which is part of
monitor_sbus.c file (same file where monitor_common_send_id() is
declared), there is no reason to expose the function.
Signed-off-by: Fabiano Fidêncio <firstname.lastname@example.org>
Reviewed-by: Pavel Březina <email@example.com>
Reviewed-by: Jakub Hrozek <firstname.lastname@example.org>
Reviewed-by: Lukáš Slebodník <email@example.com>