SPIGOT-5053: Initialize beacon with stored levels where available

nms-patches/TileEntityBeacon.patch

@@ -119,7 +119,7 @@
      public void a(SoundEffect soundeffect) {
          this.world.a((EntityHuman) null, this.position, soundeffect, SoundCategory.BLOCKS, 1.0F, 1.0F);
      }
-@@ -254,8 +309,10 @@
+@@ -254,8 +309,11 @@
      @Override
      public void load(NBTTagCompound nbttagcompound) {
          super.load(nbttagcompound);
@@ -128,6 +128,7 @@
 +        // Craftbukkit start - persist manually set non-default beacon effects (SPIGOT-3598)
 +        this.primaryEffect = MobEffectList.fromId(nbttagcompound.getInt("Primary"));
 +        this.secondaryEffect = MobEffectList.fromId(nbttagcompound.getInt("Secondary"));
++        this.levels = nbttagcompound.getInt("Levels"); // SPIGOT-5053, use where available
 +        // Craftbukkit end
          if (nbttagcompound.hasKeyOfType("CustomName", 8)) {
              this.customName = IChatBaseComponent.ChatSerializer.a(nbttagcompound.getString("CustomName"));