Use correct method for getting player's team. Fixes BUKKIT-4050

The method getTeam gets the team from name of, as opposed to getting the
team a player belongs to.

This also addresses BUKKIT-4002 and partially BUKKIT-4044

src/main/java/org/bukkit/craftbukkit/scoreboard/CraftScoreboard.java

@@ -93,7 +93,7 @@ public final class CraftScoreboard implements org.bukkit.scoreboard.Scoreboard {
     public Team getPlayerTeam(OfflinePlayer player) throws IllegalArgumentException {
         Validate.notNull(player, "OfflinePlayer cannot be null");
 
-        ScoreboardTeam team = board.getTeam(player.getName());
+        ScoreboardTeam team = board.getPlayerTeam(player.getName());
         return team == null ? null : teams.get(team.getName());
     }