[kstyle] Reverse default sort order indicator arrow direction

The direction of the sort order indicator arrows has historically been
controversial:

1. Camp A asserts that the arrow should reflect the currently applicable
   word: "ascending" or "descending". For example Ascending order should
   be represented by the arrow pointing up. It's ascending, get it?

2. Camp B asserts than the arrow should reflect the visible order of
   items in the view. For example when the biggest things are on top,
   the arrow should be pointing down; it's showing you the direction of
   the visible items: big to small.

3. Camp A then correctly points out that if Camp B gets their way, the
   arrow no longer matches the word displayed in the UI ("ascending"
   or "descending).

However over the years we have accidentally solved this dilemma! We all
pretty much agree that the terms "ascending" and "descending" are
confusing to users, and we have replaced them with human-readable
descriptions such as "A-Z" and "Largest first". As a result, the arrows
are no longer consistent with the words "ascending" or "descending"
because we no longer show those words in the UI anymore. So the only
remaining thing for the arrow to be consistent with is the set of items
displayed immediately below it. For this purpose, reversing the default
order per Camp B is more appropriate because then the arrow points in
the direction of the sorting: biggest on top gets a downward-pointing
arrow, and smallest on top gets an upward-pointing arrow.

There is a hidden option in Breeze that does just that; this patch flips
it from false to true to effect the above change.