macOS: Make it easier to debug NSAutoFillHeuristicControllerEnabled (#38285)

Uses `setObject` instead of `registerDefaults`, so that it can be read
with `defaults read dev.zed.Zed`. Still can be overrided.

Release Notes:

- N/A
ee399ebccfSmit Barmase committed on 9/16/2025, 10:19:47 PM· committed by GitHubparent54c82f2
1 file changedLine totals unavailable