Aqueducts not detecting water sourceblocks on top

[Foreck1]

If possible, aqueducts should detect if a water source is on top of them instead of just on a top corner. When using biome whitelists it can be complicated to start at the right block for biome transition to work and it can be non-intuitive. It would be easier to place aqueducts into the biome water source as well as in a current, but the former doesn't work with adjacent aqueducts.