Falling sand entities with water or lava block ids do not render properly

When spawning falling sand entities (i.e. through a modified mob spawner) with water or lava block ids, only the top face of the water/lava is rendered. In previous versions this would render the whole water/lava block instead (which could be used for things like spraying fountains).

This can be fixed by having falling sand entities render fluid ids as blocks, instead of using their 'correct' render method.