Creative Mode Inventory Screen counts empty tabs when determining page count

[Commoble]

Minecraft Version: 1.21.1

NeoForge Version: 21.1.62

Logs: no logs

Steps to Reproduce:

1. Register a single creative tab with no contents
2. Open the creative menu
3. Observe that the creative menu adds a second page with no extra tabs

Description of issue:

Neoforge expands the creative inventory screen to support more than one page of tabs, to support indefinitely many mods adding their own creative tabs. This is fine.

However, there is a discrepancy in how tabs are rendered:

1. When determining how many pages should exist, the number of tabs are counted (via CreativeModeTabRegistry.getSortedCreativeModeTabs(), regardless of their contents or visibility
2. When determining whether to render a given tab's... tab? The little clickable nubbins that switch to that tab, only tabs filtered by CreativeModeTab::shouldDisplay are rendered

This means that empty tabs (which can be empty for legitimate reasons, such as all of a mods' content being disabled by configs, or a mod creating a tab for datapacks and addons to add content to without adding anything itself) can inflate the page count and result in empty pages-of-tabs existing

Ordinary creative tab:

Empty creative tab: observe, page 2 still exists but is empty!

If there are a lot of empty tabs this can get increasingly absurd