Fix 12661 (#12744)

* Revert "persist last-intersected status update and restore when ScrollableList is restored"

This reverts commit 07e26142ef6a8e74bd2ac5e9b461a5a1699bd4c8.

accidentally merged spurious code in https://github.com/tootsuite/mastodon/pull/12661.  https://github.com/tootsuite/mastodon/pull/12735 removes the slowdown that this code was trying to solve; and other functionality successfully restores the view state of the list

* Revert "cache currently-viewing status id to avoid calling redux with identical value"

This reverts commit c93df2159fbd3888a5c48d8a8b8ae61dbbc54b89.

accidentally merged spurious code in https://github.com/tootsuite/mastodon/pull/12661.  https://github.com/tootsuite/mastodon/pull/12735 removes the slowdown that this code was trying to solve; and other functionality successfully restores the view state of the list