Update PotionEffects on player death. Fixes BUKKIT-2673

On player death player PotionEffects need to be updated so that a player's
invisibility and other effects are removed, otherwise they will persist
after a respawn. This is a carry-over from our use of persistent player
entities.

src/main/java/net/minecraft/server/EntityPlayer.java

@@ -261,6 +261,9 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
         }
 
         this.closeInventory();
+
+        // Update effects on player death
+        this.updateEffects = true;
         // CraftBukkit end
     }