Unauthenticated clients can modify Livechat Business Hours

**Summary:** Missing authentication of the `livechat:saveOfficeHours` Meteor.method allows unauthenticated clients set global Livechat Business Hours.

Meteor.methods({
	'livechat:saveOfficeHours'(day, start, finish, open) {
		console.log('Method "livechat:saveOfficeHour" is deprecated and will be removed after v4.0.0');
		LivechatBusinessHours.updateDayOfGlobalBusinessHour({
			day,
			start,
			finish,
			open,
		});
	},
});