General: Fix nesting in compat.php.

Follow up to [57451].

Built from https://develop.svn.wordpress.org/branches/5.7@57456


git-svn-id: http://core.svn.wordpress.org/branches/5.7@56957 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/compat.php

@@ -369,6 +369,7 @@ if ( ! function_exists( 'is_iterable' ) ) {
 	function is_iterable( $var ) {
 		return ( is_array( $var ) || $var instanceof Traversable );
 	}
+}
 
 if ( ! function_exists( 'str_starts_with' ) ) {
 	/**
@@ -415,4 +416,3 @@ if ( ! function_exists( 'is_iterable' ) ) {
 		return substr( $haystack, -$len, $len ) === $needle;
 	}
 }
-}