When no `$meta` arguments are passed to `wpmu_create_blog()`, `public` is set to `0` in the database for new sites. This is fine, but also does not match the default implied when most sites are created via `site-new.php`.
The only current use of the `$meta` argument in the tests is to (re)mark `public` as `0`. All existing tests pass with this change. Tests for `WP_Site_Query` can now rely on better default expectations.
See #36566.
git-svn-id: https://develop.svn.wordpress.org/trunk@37418 602fd350-edb4-49c9-b593-d223f7449a82
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