fix(element/scrollable): render horizontal directed contents correctly

examples/container.zig

@@ -116,7 +116,7 @@ pub fn main() !void {
         .rectangle = .{ .fill = .blue },
         .layout = .{
             .gap = 1,
-            .direction = .vertical,
+            .direction = .horizontal,
             .padding = .vertical(1),
         },
     }, .{});