nixos: k3: filesystems: refer by ID, not UUID
nixos: k3: filesystems: refer by ID, not UUID

This is more human-friendly, and also because we always use
dm-crypt/LUKS across disk wipes with the same naming scheme, is more
resilient.

listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg,listx/syscfg