Don't pre-install cryfs and encfs

Nate Grahamrequested to merge
work/ngraham/lessfs into master

These were formerly supported as encryption backends for Plasma Vaults. Nowadays only gocryptfs is supported for new vaults, though the other two remain supported for compatibility with older vaults, so it can be nice to keep them around.

However anyone migrating to KDE Linux needs to do a re-install anyway, and if they migrate their data, they'll have to do it manually. Thus it's reasonable for anyone who's enough of an expert to accomplish this to migrate any old vaults they have to the supported gocryptfs backend.

Thus, get rid of the two legacy backends.

Bonus commit: stop asking for gocryptfs explicitly, since it's a mandatory dependency of plasma-vaults and thus gets pulled in automatically

Edited by Nate Graham

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