Always allow accessing edit.php?post_type=wp_navigation page #38170
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Fixes #38118.
The Navigation block is supported in both block themes and classic themes, so it is incorrect to only allow access to
edit.php?post_type=wp_navigation
when the current theme is a block theme.This fixes a bug where clicking on 'Manage menus' in the toolbar of a Navigation block takes you an error page when running a classic theme.
It's the same fix as what's in https://core.trac.wordpress.org/ticket/54889 but in Gutenberg. We need to make the change in both codebases so that older versions of WP running the Gutenberg plugin don't have the issue.