fix: Remove scroll-to-top on table pagination page change

[Warbs816]

Summary

• Removes setPage() overrides in ListChannels and ListVod that dispatched a scroll-to-top event on every page change, causing the browser to smooth-scroll to the top
• Removes the now-unused global scroll-to-top JS event listener from AppServiceProvider and the orphaned HtmlString import

Test plan

• Navigate to Channels list, scroll down, change page — scroll position should be preserved
• Navigate to VOD list, scroll down, change page — scroll position should be preserved
• Confirm other tables (Series, Groups, Playlists, etc.) still paginate normally

[sparkison]

Good call! This was from a while back before the tables had a max height and fixed header, but it doesn't make much sense now 😉