Fix scale when using absolute scores as transparency values

[Xewar313]

Currently, if file contains scores (-5, 3,10), the scale after transparency modifier is set to use absolute values is still [-5, 10], what provides bad visual information to the user (entry with score 3 will still be vibrant in color, and it shouldn't be). Handling of scales should be fixed, so that the scale used by coloring function after enabling absolute value is [3,10]