Fix 030.schema.metabib.sql breakage.

The fix for LP 1322285 introduced a change to 030.schema.metabib.sql
that was not only not needed, but breaks building a fresh schema.

Signed-off-by: Jason Stephenson <jstephenson@mvlc.org>
Signed-off-by: Thomas Berezansky <tsbere@mvlc.org>