Swaps the order of the '+' and '-' button in the File Browser file name field, so that '-' comes first. For increasing or decreasing a value it makes more sense to have decreasing first, increasing last. Consistent to how you press on the left side of a number button for decrease, and right to increase. However this is inconsistent in another way: Usually we have a '+' button before a '-' button, but that refers to adding and removing items, not increasing or decreasing. The icons are also placed in their own buttons then, making them look more separate. So the UI Team agreed on accepting that trade-off, see today's meeting notes: https://devtalk.blender.org/t/2020-10-21-ui-team-upcoming/15849