Remove left-over debug code after [46203].

See #46349.

git-svn-id: https://develop.svn.wordpress.org/trunk@46204 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-login.php

@@ -1243,7 +1243,7 @@ switch ( $action ) {
 				// to the admin email confirmation screen.
 				/** This filter is documented in wp-login.php */
 				$admin_email_check_interval = (int) apply_filters( 'admin_email_check_interval', 180 * DAY_IN_SECONDS );
-$admin_email_lifespan = 5;
+
 				if ( $admin_email_check_interval > 0 && time() > $admin_email_lifespan ) {
 					$redirect_to = add_query_arg( 'action', 'confirm_admin_email', wp_login_url( $redirect_to ) );
 				}