We now have a nice preference to control whether to display factors or
percentages, so it doesn't make sense to manually define properties with
In two cases the percentage property was actually used incorrectly, as
pointed out in T82070. The range was [0, 1], but the properties were still
displayed as percentages:
Given the the existance of RNA_def_float_factor, this patch completely
removes RNA_def_float_percentage to prevent further confusion. I would
be fine leaving this change out, but it's worth considering.