lei_mail_sync: cleanup stale/dangling fids if possible

I'm not sure how it happens or if/when it was fixed, but my
earliest lei installations have hit some
"E: fid=$fid for $oidhex unknown" messages on `lei import'
invocations.

This really should've enabled the foreign keys pragma to begin
with; but we'll probably start using that in the future.  For
now, at least rely on a transaction to keep things consistent
in SQLite.

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