Remove the unsigned ceiling transform.

Revert commits 292c043 and 04d9cd4.
There is no significant speed boost compared to the already
existing ceiling to truncate transform and in some cases
the new transform produced slower code.

TODO: Find methods for ceiling/floor to multiply transformation
that are faster than the current ones, if possible.
Remove one of the CHOOSE-MULTIPLIER functions.

Calculate its results by scaling the direct multiplication
values instead.