Get meta for Area2D objects from the object itself instead of the layer

This also disables setting metas on the child CollisionShape2D since
there's no clear way to decide what should go in there.

Author: nerochiaro

export_to_godot_tilemap.js

@@ -181,7 +181,7 @@ class GodotTilemapExporter {
                                 collision_mask: object.property("collision_mask")
                             }
                         ),
-                        this.meta_properties(layer.properties())
+                        this.meta_properties(object.properties())
                     );
 
                     const shapeId = this.addSubResource("RectangleShape2D", {
@@ -200,7 +200,7 @@ class GodotTilemapExporter {
                                 position: `Vector2( ${objectPositionX}, ${objectPositionY} )`,
                             }
                         ),
-                        this.meta_properties(layer.properties())
+                        {}
                     );
                 } else if (object.type == "Node2D") {
                     this.tileMapsString += stringifyNode(