fixed scheduled backup triggers twice, not once, if `require_online_p…

…layers` is enabled

fixed #20

prime_backup/mcdr/crontab_job/scheduled_backup_job.py

@@ -58,7 +58,7 @@ def run(self):
 			online_players = OnlinePlayerCounter.get().get_online_players()
 			base_msg = 'Scheduled backup player check: valid={} ignored={}'.format(online_players.valid, online_players.ignored)
 			if online_players is not None and len(online_players.valid) == 0:
-				if self.__backups_without_players > 1:
+				if self.__backups_without_players >= 1:
 					self.logger.info('{}, backup skipped'.format(base_msg))
 					return
 				self.__backups_without_players = self.__backups_without_players + 1