make slider slightly less ugly

luigi/widget/slider.lua

@@ -73,8 +73,6 @@ return function (self)
     self:onReshape(function (event)
         local x1, y1, w, h = self:getRectangle(true, true)
         local x2, y2 = x1 + w, y1 + h
-        local dim = math.min(w, h)
-        thumb.width, thumb.height = dim, dim
         if self.flow == 'x' then
             local halfThumb = thumb:getWidth() / 2
             x1, x2 = x1 + halfThumb, x2 - halfThumb