Shulker minecart riding offset

During the refactoring of the riding offset between 1.20.2 and 1.20.3 the value for the shulker dropped from 0.1875 to 0, resulting in broken farms. The workarounds from 1.20.1 to 1.20.2 due to armor stands are no longer viable, because the shulkers don't attach on the same place as before.