fix: make all appends in realm re-init slices

[thehowl]

still need to test this out with the live realm :)

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[tbruyelle]

Tested with all the traces I've setup to track that bug and it works perfectly, match making is stable now!!

Here is the trace I added, can be helpful for other bug:

func Render(string) string {
	var s string
	now := time.Now()
	for tc, sublob := range lobby {
		s += ufmt.Sprintf("<h3>lobby %s</h3>", tc)
		for i, pl := range sublob {
			lastSeen := now.Sub(lobby[tc][i].seenAt)			
			s += ufmt.Sprintf("<p>player%d %s<br/>seentAt=%s</br>now=%s</br>duration=%s </p>", i, pl.player.Address, pl.seenAt, now, lastSeen)
		}
	}
	s += "<h3>GAMES</h3>"
	lobbyPlayer2Game.Iterate("", "", func(key string, value interface{}) bool {
		g := value.(*Game)
		s += ufmt.Sprintf("<p>Player %s %s</p>", key, g.ID)
		return false
	})

	s += "<h3>PLAYERS</h3>"

	playerStore.Iterate("", "", func(key string, value interface{}) bool {
		s += ufmt.Sprintf("<p>Player %s</p>", key)
		return false
	})

	return s
}