Fix packet error

Fixes "BAD PACKET ID" from being thrown whenever this.action == 1 as per [mc-dev](https://github.com/Bukkit/mc-dev/blob/master/net/minecraft/server/Packet207SetScoreboardScore.java#L32-L35).
Merge pull request #2 from btilm305/master

Fix packet read/write info for Packet207SetScoreboardScore