find(1): Fix locate database updating, again. :)

find(1): Fix locate database updating, again. :)

This commit re-applies 83c5db2eae3d86.

I should have been more clear in its commit message that locate.updatedb
was not failing with an error if this local change wasn't kept, but that
the database was incomplete and of a much smaller size.

When testing find(1) after an upgrade, a good general rule is that
/var/db/locate.database needs to have about the same size after the
upgrade as it had before the upgrade.