Coding Standards: Remove redundant check in delete_expired_transients().

The check in the `elseif` branch would always be true, as the preceding `if` is for `! is_multisite()`.

Follow-up to [41963].

Props justlevine.
See #63268.

git-svn-id: https://develop.svn.wordpress.org/trunk@60448 602fd350-edb4-49c9-b593-d223f7449a82

Author: SergeyBiryukov

src/wp-includes/option.php

@@ -1669,7 +1669,7 @@ function delete_expired_transients( $force_db = false ) {
 				time()
 			)
 		);
-	} elseif ( is_multisite() && is_main_site() && is_main_network() ) {
+	} elseif ( is_main_site() && is_main_network() ) {
 		// Multisite stores site transients in the sitemeta table.
 		$wpdb->query(
 			$wpdb->prepare(