Bundles UI rework (Performance)

Hey Slappers,

Another small patch, this time to improve performance in the bundles UI. Because it was previewing so many cosmetics at once, some PCs couldn't keep up.

The UI now only shows the full bundle itself. You can still see the individual cosmetics when clicking on the bundle to go to its details.

I've also found a free performance improvement for all UI with a scrollbar which is in this patch too.

GLHF Oddshot Games