findutils: make updatedb ignore btrfs snapshots

Updatedb was supposed to ignore btrfs snapshots but due to misspelling it
didn't. This update fixes the spelling and thus the btrfs snapshots are
indeed ignored.

Fixed bugs
bnc#780918
updatedb indexes all btrfs snapshots by default
bnc#813293
locate finds files in btrfs snapshots
Selected Binaries
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