change meta_key = meta-desc -> meta_desc

inc/template.php

@@ -74,7 +74,7 @@ function dw_meta_desc() {
 	$post = get_post( $post );
 	setup_postdata( $post );
 	if ( is_single() || is_page() ) {
-		$meta_desc_value = get_post_meta( $post->ID, 'meta-desc', true );
+		$meta_desc_value = get_post_meta( $post->ID, 'meta_desc', true );
 		if ( $meta_desc_value !== '') {
 			echo $meta_desc_value; 
 		}