[TYPO3-seminars] Limit multiple seats

[Niels Pardon]

The quick solution would have been:

plugin.tx_seminars_pi1.form.registration.step1.elements.seats.data.items >
plugin.tx_seminars_pi1.form.registration.step1.elements.seats.data.items {
	1 {
		caption = 1
		value = 1
	}
	2 {
		caption = 2
		value = 2
	}
	3 {
		caption = 3
		value  = 3
	}
}

;-)