Resolve clippy lint.

.any(condition) is the same as .find(condition).is_some(), since we
aren't using the result of .find()

deepwell/src/database/seeder/data.rs

@@ -52,7 +52,7 @@ impl SeedData {
         for (site, pages) in &mut site_pages {
             // Verify that the site exists
             assert!(
-                sites.iter().find(|s| &s.slug == site).is_some(),
+                sites.iter().any(|s| &s.slug == site),
                 "No site with slug {}",
                 site,
             );