Blender Git Loki

Fix (studio-reported) liboverride resync crash after recent changes.

Recent own rBabf3ce811f6e prevented any LayerCollection update during
the whole liboverride resync process, for both performances and feature
reasons.

However that means that the various runtime caches like the Base GHash
are not cleared anymore during ID remapping process, so we need to call
`BKE_main_collection_sync_remap` instead of `BKE_main_collection_sync`
when we finally are ready for this update.

Reported by @eyecandy (Andy Goralczyk) from Blender studio, thanks!