Setting MUIA_List_SortColumn changes sort order

[afalkenhahn]

Take a look at the attached sample. Press the button, it will make column 1 the sort column. This works correctly. Now press the button again. Surprisingly, the sort order of column 1 will be reversed now. This shouldn't happen. Pressing the button a second time should do nothing since column 1 is the sort column already.
main.txt

[tboeckel]

Fixed in the next nightly build.