Fix schema 27 upgrade for H2

On H2 we have to include "NOT NULL" because the column is part of the
primary key, and the alter statement thinks we are trying to remove
the NOT NULL constraint.

Change-Id: I303126f5022d6325279c8dfddb0869c80911faf1
Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed