You can set your 32x63 tileset’s tile render size to “map grid size” in the Tileset Properties, and the door will be shrunk to fit the 32x32 grid space. You can change the exact behaviour of this shrinking via the Fill Mode property.
However, since your door tileset is scaled up to begin with, in the interest of performance in-game and wider compatibility (the tile render size and fill mode properties are not supported by all Tiled loaders), it would probably be a better idea to resize your tileset image in an image editor, so that all the “pixels” are the same size across tilesets.