Transfer className alias patch to Object class, update db

[kennethloeffler]

Today, Roblox changed the base class of Instance to a new abstract base class called Object. As part of this change, the ClassName and className properties now belong to Object, which currently causes rbx_reflector generate to exit with an error due to an alias patch for className:

     Running `target/debug/rbx_reflector generate rbx_reflection_database/database.msgpack rbx_dom_lua/src/database.json --patches patches`
[INFO  rbx_reflector::cli::defaults_place] Installing Studio plugin
[INFO  rbx_reflector::cli::defaults_place] Starting Roblox Studio...
[INFO  rbx_reflector::cli::defaults_place] Waiting for Roblox Studio to re-save place...
[INFO  rbx_reflector::cli::defaults_place] Uninstalling Studio plugin
[INFO  rbx_reflector::cli::defaults_place] Place saved, killing Studio...
Error: Property Instance.className modified in patch file does not exist in database

This PR changes the className alias patch so it's appropriately on the Object class, and updates the reflection database.

(does this change need a more specific changelog entry beyond "updated to Roblox 647")?

[kennethloeffler]

Brittle test :(

hold on....