Fix detection of missing or invalid tile entities for End portals and gateways

By: Jacob Martin <jjm_223@hotmail.com>

paper-server/nms-patches/WorldServer.patch

@@ -160,7 +160,7 @@
 +                result = fixTileEntity(pos, type, result);
 +            }
 +        } else if (type == Blocks.END_PORTAL) {
-+            if (!(result instanceof TileEntityEndGateway)) {
++            if (!(result instanceof TileEntityEnderPortal)) {
 +                result = fixTileEntity(pos, type, result);
 +            }
 +        } else if (type == Blocks.SKULL) {
@@ -187,7 +187,7 @@
 +            if (!(result instanceof TileEntityStructure)) {
 +                result = fixTileEntity(pos, type, result);
 +            }
-+        } else if (type == Blocks.END_PORTAL) {
++        } else if (type == Blocks.END_GATEWAY) {
 +            if (!(result instanceof TileEntityEndGateway)) {
 +                result = fixTileEntity(pos, type, result);
 +            }