common: disable btrfs fsck in fsck_types
Btrfs doesn't need nor use a regular fsck utility. This was wrongly added in b31a5d9f and currently makes genfstab
generate btrfs entries with fs_passno
not set to 0
, which was set in previous releases.
I'd like to keep the entry in fsck_types
and explicitly set it to 0 for future-proof reasons.