Use dirname for cleaner paths

Author: schlessera

features/bootstrap/FeatureContext.php

@@ -784,10 +784,10 @@ public function download_wp( $subdir = '' ) {
 
 		// Disable emailing.
 		mkdir( $dest_dir . '/wp-content/mu-plugins' );
-		copy( __DIR__ . '/../extra/no-mail.php', $dest_dir . '/wp-content/mu-plugins/no-mail.php' );
+		copy( dirname( __DIR__ ) . '/extra/no-mail.php', $dest_dir . '/wp-content/mu-plugins/no-mail.php' );
 
 		// Add polyfills.
-		copy( __DIR__ . '/../extra/polyfills.php', $dest_dir . '/wp-content/mu-plugins/polyfills.php' );
+		copy( dirname( __DIR__ ) . '/extra/polyfills.php', $dest_dir . '/wp-content/mu-plugins/polyfills.php' );
 	}
 
 	public function create_config( $subdir = '', $extra_php = false ) {