win32u: Allocate the whole max_points for the top_points array. The eventual array will only need 1/2 of the points, but we need the whole max_points to generate the ellipse top half. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57306
win32u: Always select the point that's closer to the ellipse. Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=57296