SPIGOT-5801: End gateways crash server upon enderpearl use through them

nms-patches/TileEntityEndGateway.patch

@@ -30,7 +30,7 @@
 +                        return;
 +                    }
 +
-+                    ((EntityPlayer) entity).playerConnection.teleport(teleEvent.getTo());
++                    ((EntityPlayer) entity1).playerConnection.teleport(teleEvent.getTo());
 +                    this.h(); // CraftBukkit - call at end of method
 +                    return;
 +