Blender Git Loki

Fix T75203: Crash when changing active keying set

When updating the active button, the search data wasn't updated, so it
kept using the old pointers. A check in `ui_rna_collection_search_cb()`
relied on this incorrect behavior so I had to fix that too. Note that
the previous commit was also needed for the second fix to work.

Caused by c46dcdf8871e.