Stub FlxTilemap to render tree tops on top of a ship.

Like 2.5D in Legend of Zelda: A Link to the Past.
Render land on top of ship in same row.
Revert "Stub FlxTilemap to render tree tops on top of a ship."

This reverts commit 3249083eb2605512ba4f42db84ada740b295307d.
Looks strange from side.  May try beach edge and tree interior.