[ldtk] Fix tile field type name

[gaboose]

Found this while adding an Array<Tile> field to an entity with LDtk 1.5.3.

In the json schema it says:

For Tile, the value is a TilesetRect object.

Which explains the confusion a little bit. The type string that appears under "__type" is "Tile" while the type name is "TilesetRect".

[jeremyfa]

Good catch thanks!