Fix loading of LAB KPL swatches.
Not only was the wrong element being read, but also the formula was wrong. I should create a unittest for this when I am going to refactor the palettes again. BUG:441139
Loading
Not only was the wrong element being read, but also the formula was wrong. I should create a unittest for this when I am going to refactor the palettes again. BUG:441139
mentioned in commit 434b1d5a